Answer:
2385.49 grams of cobalt.
Explanation:
1. Convert 40.48 moles of Co (cobalt) into grams (mass):
The molar mass of cobalt is 58.933195 g/mol.
[tex]40.48 mol Co = \frac{58.93 g/mol}{1 mol Co} = 2385.49 g[/tex]
What is the chemical formula for the compound ammonium phosphate? Use the list of polyatomic ions and the periodic table to help you answer.
A.
NH4H2PO4
B.
(NH4)2PO4
C.
(NH4)3PO4
D.
(NH4)4PO4
Answer:
c. (NH4)3PO4
Explanation:
Answer:
c is the right answer
Explanation:
as we know ammonium is NH4
AND PHOSPHATE IS PO4-3
SO WHEN WE MIX THEM THEY BECOME
(NH4)3PO4
Which action could cause a sample of liquid to boil?
A. Decreasing the temperature of the liquid
B. Decreasing the sample size of the liquid
C. Decreasing the pressure on the liquid
D. Decreasing the volume of the liquid
Hurry please
Answer:
B
Explanation:
Decreasing the sample size of the liquid
hope it helps!
150.0 mL of oxygen is collected over water at 19.0oC and 100.0 kPa. If the dry volume becomes 100.0 mL and the pressure of the dry gas becomes 105.0 kPa, what will the new temperature be?
Answer:
The new temperature will be 204.4 K
Explanation:
As the volume increases, the particles (atoms or molecules) of the gas take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:
"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"
Boyle's law is expressed mathematically as:
Pressure * Volume = constant
or P * V = k
Charles's Law consists of the relationship between the volume and the temperature of a certain quantity of ideal gas, which is kept at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .
In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Finally, Gay-Lussac's law can be expressed mathematically as follows:
[tex]\frac{P}{T} =k[/tex]
This law indicates that the quotient between pressure and temperature is constant.
This law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the molecules of the gas move faster. Then the number of collisions against the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
[tex]\frac{P*V}{T} =k[/tex]
You want to study two different states, an initial state and a final state. It will happen:
[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]
In this case:
P1= 100 kPaV1= 150 mLT1= 19 C= 292 K (being 0 C= 273 K)P2= 105 kPaV2= 100 mLT2=?Replacing:
[tex]\frac{100 kPa*150 mL}{292 K} =\frac{105 kPa*100 mL}{T2}[/tex]
Solving:
[tex]T2=105 kPa*100 mL*\frac{292 K}{100 kPa*150 mL}[/tex]
T2= 204.4 K
The new temperature will be 204.4 K
50.0 ml of 2.60 M HBr(aq) was exactly neutralized (final pH=7) by a 1.80 M solution of NaOH(aq). How much volume of of the NaOH solution was added ?
Answer:
72.2 ml
Explanation:
The neutralization equation between HBr (acid) and NaOH (base) is the following:
HBr(aq) + NaOH(aq) → NaBr(aq) + H₂O(l)
We can see that 1 mol of HBr reacts with 1 mol of NaOH. At the equivalence point, the total number of moles of HBr reacts with the total number of moles of NaOH. The number of moles can be calculated as the product between the molarity (M, in mol/L) and the volume (V). So, we can equal the quantities of acid and base, as follows:
moles HBr = moles NaOH
M(HBr) x V(HBr) = M(NaOH) x V(NaOH)
Now, we calculate the volume of NaOH with the data:
V(NaOH)= M(HBr) x V(HBr)/M(NaOH)
= (2.60 mol/L x 50.0 ml)/(1.80 mol/L)
=72.2 ml
What can you determine about the atomic structure of an element if you know the atomic number of the element and mass number of its isotope? Enter your answer in the space provided.
Answer:
THe atomic number of an element is the same number of protons and electrons the element has.
Explanation:
The atomic number is the number of protons that is equal to the of electrons. Also, the mass numbers can be used for the number of neutrons. So the isotope of the element and its valency can be determined by the atomic number and mass number.
What is the atomic number?Because they are calculated by counting whole items, the atomic b and mass number are always whole values (protons, neutrons, and electrons). The total number of subatomic particles found in an atom is equal to the sum of the mass number and atomic number for an atom (A-Z). The mass number indicates, in atomic mass units, the mass of the atom's nucleus (amu).
The amount of protons each element has determined its atomic number, which is used to distinguish one element from another. The total number of protons and neutrons in an element determines its mass number.
All of the elements in the contemporary periodic table have rising atomic numbers, and as a result, increasing mass numbers. As you are aware, an atom is made up of protons, neutrons, and electrons.
We can determine an atom's valency by counting the number of electrons in its outermost shell. Similar to this, the atomic number and mass number of the atom are related to the number of protons and neutrons.
Therefore, the knowledge of the atomic number and mass number can help in determining the valency and isotope of the element.
Read more about the atomic numbers, here
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CAN SOMEONE PLEASE CHECK MY ANSWER FOR QUESTION 2
If it’s wrong please correct me
Thank you!!!
Answer:
It looks right to me make sure you have sig figs if the question asked for it though so you smalles figure would be 3 so with sig figs your answer would be 1190cm3
When the moon changes from all dark to all light, or from new moon to full moon, the moon is said to be...
changing shape
waxing
waning
gibbous
Answer:
i think its changing shape if I'm wrong I'm sorry
Sulfuryl chloride decomposes at high temperatures to produce sulfur dioxide and chlorine gases:
SO2Cl2(g) = SO2(g) + Cl2(g)
At 375°C the equilibrium constant Kc is 0.045. If there are 2.0 grams of sulfuryl chloride, 0.17 gram of sulfur dioxide, and 0.19 gram of chlorine present in a 1.0 Liter flask.
a. What is the value of the reaction quotient?
b. Is the system at equilibrium?
c. In which direction will the system move to reach equilibrium?
Answer:
[SO2Cl2] = = 0.015 M [SO2] = = 0.0027 M [Cl2] = = 0.0027 M Q = = = 4.8 × 10−4
No. Q < Kc, so reaction will shift to the right.
Explanation:
A student calculated the number of moles of carbon dioxide to be 0.30 moles in a 200.0 g sample of a gaseous mixture. What is the percent composition of carbon dioxide? (molar mass = 44.01 g/mol)
A. 0.066%
B. 13%
C. 30%
D. 6.6%
Considering the definition of percentage by mass, the correct answer is option D. the percent composition of carbon dioxide is 6.6%
Percentage by massThe percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
[tex]percentage by mass=\frac{mass of solute}{mass of solution} x100[/tex]
Percent composition of carbon dioxideIn this case, you know:
mass of solute= 0.30 moles × [tex]\frac{44.01 grams}{1 mole}[/tex]= 13.203 grams (being 44.01 [tex]\frac{grams}{mole}[/tex] the molar mass of carbon dioxide)mass of solution= 200 gramsReplacing in the definition of percentage by mass:
[tex]percentage by mass=\frac{13.203 grams}{200 grams} x100[/tex]
Solving:
percentage by mass= 6.60 %
Finally, the correct answer is option D. the percent composition of carbon dioxide is 6.6%
Learn more about percentage by mass:
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10) Calculate the energy change for the formation of LiCl(s) from its elements in their standard states and the following tabulated information: ?
1 Li(s) + 1/2 C12(s) — LiCl(s)
2 Li+(g) + Cl-(s) -- LiCl(s)
3 Li(s) — Li(g)
4 1/2 Cl2(g) - Cl(g)
5 Cl(g) + e- →Cl-(3) Li(g) → Lit(g) + e-
1-853 kJ/mol
2+159.4 kJ/mol
3+121.7 kJ/mol
4-348.6 kJ/mol
5+520.2 kJ/mol
A) +1305.7 kJ/mol
B) +296.9 kJ/mol
C) -400.3 kJ/mol
D) -627.2 kJ/mol
Answer:
-400.3 kJ/mol
Explanation:
Rank the following elements by increasing atomic radius: Carbon, aluminum, oxygen, potassium.
⊂(◉‿◉)つ༼☯﹏☯༽(⊃‿⊂)
Answer
The elements in increasing order of atomic radius: oxygen, carbon, aluminum, potassium
Explanation:
The distance from the center of the nucleus to the outermost shell of the electron is known as the atomic radius of an element. The atomic radius decreases rightward along each period (row) of the table due to the increase in effective nuclear charge (the charge of the nucleus equal to the number of protons). Across a period, electrons are added to the same energy level and the increasing number of protons causes the nucleus to exert more pull on these electrons, which makes the atomic radius smaller. Atomic radius increases down each group (column) of the periodic table because of the addition of electrons to higher energy levels, which are further away from the nucleus and the pull of nucleus weakens. Another reason for the increase in atomic radius is the electron shielding effect, which is the reduction of the attractive force between a nucleus and its outer electrons due to the blocking effect of inner electrons
While moving from left to right in the second period, c arbon comes before oxygen and so oxygen will have a smaller atomic radius than carbon. While moving down the periodic table, al uminum comes before potassium even if they are not in the same period. So aluminum 's atomic radius will be smaller than that of potassium but bigger than that of carbon and oxygen.
(hope that helps can i plz have brainlist it will make my day :D hehe)
Help please! This is due in 15 mins
please help
find molecular formula of a compound with a molar mass of 45.0 g/mol and an empirical formula of CH3
Answer: The molecular formula will be [tex]C_3H_9[/tex]
Explanation:
Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.
Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.
The empirical formula is [tex]CH_3[/tex]
The empirical weight of [tex]CH_3[/tex] = 1(12)+3(1)= 15g.
The molecular weight = 45.0 g/mole
Now we have to calculate the molecular formula:
[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{45}{15}=3[/tex]
The molecular formula will be=[tex]3\times CH_3=C_3H_9[/tex]
Thus molecular formula will be [tex]C_3H_9[/tex]
What is the mass in grams of a 10.2cm3 block of copper
Answer:
91.4
Explanation:
Givens
d = 8.96
v = 10.2 cm^3
m =?
Formula
d = m / V
Solution
8.96 = m / 10.2 Multiply both sides by 10.2
8.96 * 10.2 = m
m = 91.392 grams
m = 91.4 grams rounded.
Pb(OH)4 + Cu2O --> PbO2 + CuOH what is the balanced equation
Answer:
Pb(OH)4 + 2Cu2O → PbO2 + 4CuOH
Explanation:
Pb(OH)4 + Cu2O --> PbO2 + CuOH
The end goal of balacing chemical equations is to make sure there is no gain or loss of atoms of elements. Number of atoms of elements in the left side (reactant) must balance with the right side (product) of the reaction.
Currently, the number of Cu, H and O atoms are not balanced.
Pb
Reactant = 1, Product = 1
O
Reactant = 5, Product = 3
Cu
Reactant = 2, Product = 1
H
Reactant = 4, Product = 1
The balanced equation is given as;
Pb(OH)4 + 2Cu2O → PbO2 + 4CuOH
Pb
Reactant = 1, Product = 1
O
Reactant = 6, Product = 6
Cu
Reactant = 4, Product = 4
H
Reactant = 4, Product = 4
_____ are added to the soil to improve the fertility of the soil
Answer:
Fertilisers
And also organic compounds
Why do elements form lons? In other words, why do elements gain or lose electrons? Be specific.
Answer: Ionic bonds form only between metals and nonmetals. That's because metals “want” to give up electrons, and nonmetals “want” to gain electrons. It takes energy to remove valence electrons from an atom and form a positive ion. Energy is released when an atom gains valence electrons and forms a negative ion
How many milliliters of 0.188 M HClO 4 solution are needed to neutralize 50.00 mL of 0.0789 M NaOH?
a) 119
b) 0.742
c) 21.0
d) 0.0477
e) 8.39x10^-3
119 so a I think that's Is me anser
The volume of space it takes up, whereas its mass is the amount of matter it contains. A sample's density is the quantity of mass per unit of volume.
Equation:[tex]HClO_4 +NaOH \longrightarrow NaClO_4 + H_2O\\\\[/tex]
HClO₄ is a monoprotic strong acid.
1 mol of HClO₄ reacts with 1 mol of NaOH for neutralization.
Calculating the moles of NaOH [tex]= (0.0789\ M) \times (0.050\ L) = 0.003945\ mol[/tex]
Calculating the needed moles in HClO₄ [tex]= 0.003945 \ mol[/tex]
Calculating the HClO₄ Molarity that is 0.188 M
Calculating the HClO₄ volume that is needed [tex]= \frac{(0.003945\ mol) }{ (0.188\ M)} = 0.020\ L[/tex]
Therefore, the volume of HClO₄ that is needed = 20 mL
Find out more about the Stoichiometry here:
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37.9 grams of an unknown substance undergoes a temperature increase of
25.0*C after absorbing 969 J. What is the specific heat of the substance?
Answer:
1.023 J / g °C
Explanation:
m = 37.9 grams
ΔT = 25.0*C
H = 969 J
c = ?
The equation relating these equation is;
H = mcΔT
making c subject of formulae;
c = H / mΔT
c = 969 J / (37.9 g * 25.0*C)
Upon solving;
c = 1.023 J / g °C
what caused the falling of the twin towers?
Answer:
ok horita te ayudo ok esperame okey bueno
George W. Bush lol nvm just trolling.
Correct answer is Alquaida flew with 2 airplanes into the twin towers at the 11. September 2001
NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2
What are the reactants and products also add why
MARKING BRAINLIEST
Choose the products that complete the reaction. The chemical equation may not be balanced.
NaHCO3 + HC2H3O2
Answer: NaC2H3O2 + CO2 + H2O
How does diffusion help cells maintain homeostasis as they produce energy through cellular respiration?
Answer:
Diffusion helps cells maintain homeostasis by allowing ions to move across the cell membrane to maintaing both the voltage across the membrane and the ion concentrations.
Diffusion helps in maintaining homeostasis by allowing movement of ions in and out across the cell.
What is diffusion?Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.
There are 2 main types of diffusion:
1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.
2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.
There are 2 types of facilitated diffusion one is osmosis and dialysis.
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Which of these is NOT a type of chemical reaction?
a
b
Synthesis
Decomposition
Single Replacement
The Mole
C С
d
1. The calendar below shows a sample month of the year. Suppose that you see a full moon on the first day of this month.
Draw and label a picture of the full moon on this day.
Draw and label a picture of the third quarter moon on the day you would expect to see it.
Draw and label a picture of the new moon on the day you would expect to see it.
Draw and label a picture of the first quarter moon on the day you would expect to see it.
Answer:The 1st Quarter Moon is a primary Moon phase when we can see exactly half of the Moon's surface lit up. ... The First Quarter Moon rises around midday and is visible in the day sky. ... when the Moon has reached the first quarter of its orbit around Earth, hence the name. ... Full Moon Names · Taking pictures of the Moon.
Explanation:
If an atom has 6 electrons in its valence shell, how many will it want to gain or loose?
Answer:
gain2 electrons
Explanation:
that the answer to that question
What is the answer helpnme plz
PLS HELP DECODE THIS
The atomic number of an element tells you the number of:. P R O (G4) (E3) N S
If an atom has 5 protons, 5 neutrons and 5 electrons, what is the atom's atomic
number and atomic mass?
Answer:
Atomic mass is 10.81
Analyze the given diagram of the carbon cycle below. Use complete sentences to explain your answer.
Part 1: Which process does arrow F represent?
Part 2: Explain how matter is conserved during the process.
Part 3: Justify why this process is a recycling of carbon in the carbon cycle.
Answer:
I'm not to sure I'll ask one of my frens to help
Please can you help me from 1 to 6
Answer:
um
Explanation:
help you? you mean do it for you? nah man you can just use the calculator ;)