Using the information in the table, calculate the number of moles in a 7.89 kg sample of aspirin
(C9H8O4).
Write your answer using three significant figures.
Answers
Answer:
43.7mol
Explanation:
[tex]?mol = 7.86kg * \frac{1000g}{1kg} *\frac{1mol}{180g}[/tex]
Above is dimensional analysis method. Write what you are trying to find with the question mark and write your given info on the other side of the equal sign. Follow the units and pay attention to them cancelling out. You should have your answer unit by the end.
the 180g came from the table with masses times the chemical formula all added together. Below is exact formula.
hydrogen mass(hydrogen amount) + carbon mass(carbon amount) + oxygen mass(oxygen amount)
1g(8)+12g(9)+16g(4)=180g
180g is 1 mole of [tex]C_{9} H_{8} O_{4}[/tex]
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The flow of current is always in what direction
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Answer:
The direction of an electric current is by convention the direction in which a positive charge would move. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery.
Explanation:
Answer:
Electrons always flow in opposite directions. The direction of an electric current is by convention the direction in which a positive charge would move. Electric current flows from higher electric potential to lower electric potential.
Explanation:
which atoms typically form stable structures that are an exception to the octet rule
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help for brainlist
More than 7,000 islands in the Philippines lack access to electricity, so after the sun goes down, light usually comes through kerosene lamps. While cheap, these fire hazards are bad for the environment and human health.
You are an entrepreneur and would like to suggest to the government of the Philippines a better solution to this problem. But to come up with the solution to this problem, you must first understand the nature of chemical bonding and factors that control the structure of compounds. You will study and understand natural materials behavior to build a very cheap and environmentally friendly lamp.
What material do you think can be a cheaper and better alternative to kerosene?
Question 2 options:
There is no better alternative to kerosene.
A material that contains ions, so it can conduct electricity.
A material that contains gas, as gases can conduct electricity.
A material having covalent boding.
Answers
Answer:
Question 1: What material do you think can be a cheaper and better alternative to kerosene?
Answer: Generic lamp oil can be used to replace kerosene in lamps. The cheaper lamp oil burns cleaner and has less odor than the more expensive kerosene.
Question 2:
Correct answer is the last option
Hope this helps!
How to find the partial pressure of a gas.
Answers
Answer:
The total pressure of a mixture of gases can be defined as the sum of the pressures of each individual gas: Ptotal=P1+P2+… +Pn. + P n . The partial pressure of an individual gas is equal to the total pressure multiplied by the mole fraction of that gas.
Using diving terms, partial pressure is calculated as: partial pressure = (total absolute pressure) × (volume fraction of gas component) For the component gas "i": pi = P × F.
How is heat transferred when a person holds a pen that is already at body
temperature?
A. From the hand to the pen
B. Heat is not transferred.
C. In both directions between the pen and the hand
D. From the pen to the hand
SUBMIT
Answers
Answer:
The answer is B.
Explanation:
Heat is not transferred.
Is it possible to move the atoms close enough that the nuclei come in contact?
Answers
Answer:
I believe not.
Explanation:
From what I have been told atoms can never come into contact beyond the electron barrier.
The positvie part of the atom found in the center of the atom
Answers
If the energy of the reactants is less than
the energy of the products, what kind of reaction is it.
Answers
Could someone take a picture of an acid or a base and label them
Answers
Answer:
Ok
Explanation:
What mass of water absorbs 6700 J of heat to raise the temperature from 283K to 318K?
Answers
Answer:
you did not give the specific heat like formula like it takes 1kj to raise 28grams of water by 10 grams
Help please, take a screenshot who will answer will be brainiest.
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Answer:
1:
•a typical metal tends to have a higher melting and boiling point than a typical non metal which has a low melting and boiling point
•a typical metal tends to have a shiny appearance than a typical non metal which has a dull apearance
•and finally, a typical metal is a good conductor of electricity and heat while a typical non metal isn't
2:
elements E and C
3:
a, it doesn't conduct electricity
b, it's a good conductor of heat/ has a high melting point/ has a high boiling point (you can choose either that sits right with you)
which of these is a rough approximation of the cogito?
Answers
Given the Latin meaning of the cogito, we can confirm that it is roughly translated and summarized by the phrase "I think, therefore I am".
Cogito, ergo sum or "The Cogito" is an extremely popular, well-known philosophical phrase credited to Rene Descartes. This Latin phrase is roughly translated as "I think, therefore I am", which appeared originally in "The Principles of Philosophy", and was later translated to a variety of languages in an attempt to reach a wider public, most notably into Latin.
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how can teh human body looose heat? (conduction, convecion, radiation) and WHY
Answers
Answer:
Radiation and conduction
Explanation:
The human body lose heat by these two ways, because everything that touches our bodies and is in a temperature below us will receive part of our heat (conduction), and you can figure out that we lose heat by radiation because a human bright in a heat cam
How many dozens of silver atoms are in the piece of jewelry?.
Answers
2. What mass of water absorbs 6700 J of heat to raise the temperature from 283K to 318K?
Answers
Answer:
Q = mcT ...you can either substitute the molar heat capacity of water in the place of c or the specific heat capacity of water.
Explanation:
How many grams of zinc chloride could be formed from the reaction of 3. 57g zinc with excess hcl?.
Answers
Zn= ZnCl2
65.38g Zn= 136.315 g ZnCl2
1g Zn = 136.315/65.38 g ZnCl2
3.57 g Zn = (136.315/ 65.38) × 3.57 g of ZnCl2
3.57g Zn = 7.443g ZnCl2
7.
Wh
6
Which Lewis electron-dot diagram is correct for
CO2?
2-m
A :0
B.
:0:0:0
0:0
:
©:
::::C::0
D. 0
:0:0:
XX
Answers
Answer:
O=c=o
Explanation:
co2is nonpolar and it has linear molecular shape
Write the symbol for the atom with 38 protons, 36 electrons, and 50 neutrons and identify the element.
Answers
Answer:
Symbol: Sr2+
Element: Strontium
Explanation:
Strontium will have 38 protons, 38 electrons, and the neutron will depend on the isotope but there will usually be 48, 49, or 50 neutrons
Hope this Helps
Name the method that used to separate the components of petroleum oil.
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Answer:
fractional distillation
Explanation:
How many atoms of nitrogen are in 1.5 moles of aspartame?
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Answer:
459.11 g.
Explanation:
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Give 2 reason why cryolite is used
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Give two reasons why cryolite is used in the electrolysis of ...https://www.mytutor.co.uk › answers › GCSE › Chemistry
How many atoms of each element are in NaCI?
Enter your answer in the boxes:
|___| sodium
|___| chlorine
Answers
Answer:
well first you need 1 s then you need 1 ch
Explanation:
the atomic number of RE is 75. the atomic mass of one of its isotopes is 186. how many neutrons are in an atom of this isotopes
Answers
Answer:
111
Explanation:
Answer:
I believe Rhenium has 111 neutrons in the atoms isotopes.
Explanation:
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A 250. mL sample of oxygen is collected over water at 25 °C and 760.0 torr pressure. What is the partial pressure
of the oxygen? (Vapor pressure of water at 25°C is 23.8 mm Hg)
Answers
Answer:The mass of oxygen gas sample collected over water is 0.544 g.
The given parameters;
temperature of the oxygen gas, t = 25 °C
total pressure of the gas, P = 644 torr
volume of the gas, V = 500 mL
vapor pressure = 23.8 torr
molar mass of oxygen gas = 32 g/mol
The number of moles of the gas collected is calculated by using ideal gas equation as follows;
PV = nRT
where;
R is the ideal gas constant = 62.36 L.torr/mol.K
P is the pressure of the gas = 644 torr - 23.8 torr = 620.2 torr
T is the temperature of the gas = 25 + 273 = 298 K
V is the volume of the gas = 500 mL = 0.5 L
The number of moles of the gas is calculated as follows;
The mass of oxygen gas collected is calculated as follows;
m = 0.017 (32 g/mol)
m = 0.544 g
Thus, the mass of oxygen gas sample collected over water is 0.544 g.
Explanation:
The partial pressure of oxygen is; 760.0 torr - 23.8 torr = 736.2 torr.
What is partial pressure?We know that in a mixture of gases, the pressure that is exerted by each gas is called the partial pressure of the mixture.
In this case, we have the total pressure of the mixture as 760.0 torr and the vapor pressure of water as 23.8 mm Hg or 23.8 torr) at that temperature. Hence, the partial pressure of oxygen is; 760.0 torr - 23.8 torr = 736.2 torr.
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Answer:
The warmer the water gets the particles begin to expand and starts vibrating
A fusion reaction always creates which of the following?
a A massive amount of energy.
b A massive amount of heat.
C A more massive atomic nucleus.
d A massive number of smaller nuclei.
Answers
A fusion reaction can be regarded as the type of reaction that occurs where two lighter elements come together in a type of reaction giving rise to a heavier/more massive element.
A fusion reaction always creates a more massive atomic nucleus (option c).
When the two lighter nuclei comes together in a reaction, a more heavier/massive nucleus is formed but its mass will still be less than the combined mass of the two reactant nuclei.
This also indicates that the left over mass may have been released as energy.
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What is the mass of oxygen atoms in 0. 380 mol fe(co)5?.
Answers
Answer:39+30
Explanation:
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Answer:
Cathode rays consist mainly of electrons, they ionize substance, this leads to reduction. Any ions produced are collect by an ion trap in the tube therefore anything the beam of electrons hits is going to gain electrons.
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Answers
Answer:
The saline water should be from 1000 ppm to 3000 ppm while fresh water is less than 1000 ppm