Stoichiometry can be used to determine the molality, molarity and volume of substances in a reaction.
What is concentration?
The term concentration refers to the amount of substance present in a solution.
1. Number of moles of NaCl = 142.8 g /52 gg/mol = 2.7 moles
Molarity = 2.7 moles/ 2.3 L = 1.17 M
2. 67.5 % of magnesium chloride implies 67.5 g of MgCl2 in 100 g of solution.
Number of moles of MgCl2 = 67.5 g/95 g/mol = 0.7 moles
molality = 0.7 moles/32.5 * 10^-3 = 21.5 m
3. Number of moles of the sugar = 62.5 g/342 g/mol = 0.18 moles
Number of moles of water = 250 g/18 g/mol = 13.9 moles
Since 1 g of water = 1 cm^3 water
Molarity = 0.18 moles/250 * 10^-3 = 0.72M
Molality = 0.18 moles/250 * 10^-3 = 0.72m
Mole fraction of sugar = 0.18/(0.18 + 13.9 ) = 0.01
Mole fraction of water = 13.9 /(0.18 + 13.9 ) = 0.99
4. A 48% solution of HCl contains 48 g of HCl in 100 g of water.
Number of moles of HCl = 48 g/36.5 g/mol = 1.3 moles
Number of moles of water = 52g/18 g/mol = 2.9 moles
Mole fraction of HCl = 1.3/(1.3 + 2.9) = 0.31
Mole fraction of water = 2.9/(1.3 + 2.9) =0.69
5. 1.75 mol = 0.770 M * V
V = 1.75 mol/0.770 M
V = 2.27 L
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1. Which type of base is the chlorine molecule?
Answer:
chlorine-35 (75.53 percent) and chlorine-37 (24.47 percent)
Please help ASAP
4. Which of the following is not a characteristic of igneous rocks? (1 point)
Igneous rocks are formed when molten rock cools and hardens.
Igneous rocks have crystal grains.
Igneous rocks are larger in size because the rock cooled more slowly after the hot lava came out from the ground.
Igneous rocks have distinct layers that represent the time period when sediments were being deposited in them.
Answer:
igneous rocks have distinct layers that represents the time period
Explanation:
They are not formed overtime, nor have layers. They are just hardened lava.
is this true or false?
Answer:
I think it's true
Explanation:
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I need help on this question
Answer:
The way its parts are arranged ....I think
Is helium and neon a noble gas?
Answer: Yes
Helium (He) and Neon (Ne) are both noble gases. They are very common in our lives. Helium has a atomic number of 2, and neon has one of 10.
Hope this helps you!
this element has a mass of 500.5 g. How much
volume does it have?
Answer:
element A has a mass of 2 units, while an atom of element B
has a mass of 5 units, what would be the mass of the
compound A3 B2
Explanation:
help me please i nedd hep
Answer:
7 to 5
Explanation:
power of 500 to 5
what is an element?
Answer:
an element is a substance that cannot be broken down into any other substance. each element is made up of its own type of atom, which is why each element is different and unique than the other.
Answer:
In chemistry, an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei. The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number
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60 point! please help me please!
Answer:
[tex]\huge\boxed{\sf 21.6\ moles\ of\ MgO}[/tex]
Explanation:
Here,
for 1 mol of O₂, 2 moles of MgO are produced.
Also,
At STP:
1 mol of O₂ = 22.4 dm³/mol molar value
Moles in 242 L of O₂:
= volume / molar value
= 242 / 22.4
= 10.8 mol
Since:
1 mol of O₂ = 2 moles of MgO
10.8 mol of O₂ = 2 × 10.8 moles of Mgo
10.8 moles of O₂ = 21.6 moles of MgO
[tex]\rule[225]{225}{2}[/tex]
Water in ethanol solution which one of them is solvent?
Answer:
The mixture of ethanol and water is a liquid-liquid solution. The solvent is Water.
Explanation:
Which of the two waste products from combustion has been known to cause
harmful changes to our environment?
a. CO2
b. H2O
What is the average pH of the Pacific Ocean between Pago Pago and Apia?
Answer:
Average ocean pH is now 8.1 and varies seasonally
Explanation:
. Which of the four can trap the greatest amount of heat?
Oxygen gas
Nitrogen gas
Carbon dioxide
Orone
Answer:
CO2
Explanation:
As CO2 soaks up this infrared energy, it vibrates and re-emits the infrared energy back in all directions.
The average
energy of a gas depends
on its temperature.
Explain any periodic trends you discovered in the 6 physical properties you investigated.
pls help.
Answer:
Periodic trends are specific patterns that are present in the periodic table that illustrate different aspects of a certain element, including its size and its electronic properties. Major periodic trends include: electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character. Periodic trends, arising from the arrangement of the periodic table, provide chemists with an invaluable tool to quickly predict an element's properties. These trends exist because of the similar atomic structure of the elements within their respective group families or periods, and because of the periodic nature of the elements.
Explanation:
Electron Affinity:
electron affinity is the ability of an atom to accept an electron. Unlike electronegativity, electron affinity is a quantitative measurement of the energy change that occurs when an electron is added to a neutral gas atom. The more negative the electron affinity value, the higher an atom's affinity for electrons.
Electron affinity generally decreases down a group of elements because each atom is larger than the atom above it (this is the atomic radius trend, discussed below). This means that an added electron is further away from the atom's nucleus compared with its position in the smaller atom. With a larger distance between the negatively-charged electron and the positively-charged nucleus, the force of attraction is relatively weaker. Therefore, electron affinity decreases. Moving from left to right across a period, atoms become smaller as the forces of attraction become stronger. This causes the electron to move closer to the nucleus, thus increasing the electron affinity from left to right across a period.
Electron affinity increases from left to right within a period. This is caused by the decrease in atomic radius.
Electron affinity decreases from top to bottom within a group. This is caused by the increase in atomic radius.
Thermochemical Equations Project: Modeling Energy Changes
DOES ANYONE HAVE THIS DONE AND IS WILLING TO SEND MY WAY. NEED ASAP. ON EDGE.
Answer:
In this assignment, you will write and balance a chemical equation. Then,you will use a table of enthalpy values to calculate the energy change in the reaction. Next, you will create a model of the energy change in the reaction.Finally, you will write an explanation that describes the energy change in the reaction.
Explanation:
Please help brainiest is award.
Answer:
4
Explanation:
nonmetals are brittle and dull.
1. What is the apparatus used to measure production in plants ?
Answer: Auxanometer
Explanation:
An auxanometer (Gr. auxain= "to grow" + metron= "measure") is an apparatus for measuring the increase of growth in plants. Sensitive auxanometers allow measurement of growth as small as a micrometer, which allows measurement of growth in response to short-term changes in atmospheric composition.
I hope this helps!
Answer:
An auxonometer is used to measure production in plants
How do we know that the
substance is not water?
how many moles is 784.616 g of H2SO4?
Take the given weight (784.616g) and divide it by the atomic weight of H2SO4.
The atomic mass can be found under the element symbol on the periodic table. You must add the atomic mass for each element in H2SO4 to get the total. The total atomic mass for H2SO4 will be about 98g.
Then divide the weight by this number.
784.616g/98g = 8.006 moles
Therefore, there is approximately 8 moles.
Which statement correctly describes why a compound is a pure substance?
A compound is not a pure substance because each of its molecules is made up of the atoms of two or more different elements.
A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.
A compound is not a pure substance because it is not an element, and only elements are pure substances.
A compound is a pure substance because it consists of two different elements, which are pure substances.
Answer:
The second statement
Explanation:
Because it can't be broken by physical means
A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means. Therefore, option B is correct.
What is pure substance ?A kind of matter with a predictable chemical composition and physical properties is referred to as a chemical substance. According to certain references, chemical substances cannot be physically divided into their component parts.
A pure material has a predictable chemical make-up. A material is the same everywhere it is sampled. The safest pure examples for chemistry homework are elements and compounds. Gold, silver, helium, sodium chloride, and pure water are a few examples.
Water only includes one kind of molecule, making it a pure substance. Only molecules made up of one oxygen atom joined covalently to two hydrogen atoms can be found in pure water.
Thus, option B is correct.
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do chemical equations with no reaction still have to be balanced
Answer:
The same number of atoms of each element must appear on both sides of a chemical equation. However, simply writing down the chemical formulas of reactants and products does not always result in equal numbers of atoms. You have to balance the equation to make the number of atoms equal on each side of an equation.
Explanation:
Below is the Hertzsprung-Russell Diagram. According to the diagram which type of star is located at 3,500K and 10^6 Luminosity?
options:
blue giant
white dwarf
red super giant
red giant
Answer:red super giant
Explanation:
just look off the sides
witch color has the longest wavelength
Answer:
Red light.
Explanation:
On one end of the spectrum is red light, with the longest wavelength. Blue or violet light has the shortest wavelength. White light is a combination of all colors in the color spectrum. It has all the colors of the rainbow.
Answer:
red
Explanation:
red has a wavelength of 630-700 nm
Which of the following would best be classified as a chemical change? *
Firecracker explosion
Freezing water into ice
Magnetizing a nail
Alcohol evaporating on your skin
Lab Report
Ocean Currents
It’s time to complete your Lab Report. Save the lab to your computer with the correct unit number, lab name, and your name at the end of the file name (e.g., U2_ Lab_OceanCturrents_Alice_Jones.doc).
Introduction
What was the purpose of the experiment?
Type your answer here:
Answer:
The purpose of the experiment is to see how water of different temperature and salinity affect the density.
Explanation:
Temperature and salinity directly affect the density of the water. Water of low temperature is more dense than water of high temperature, BUT, (fresh)water with no salt is less dense than (sea)water with more salt, so temperature and salinity change density of water.
Answer:
Please post the answers for the other questions on my page!! I will give you brainiest!! Please :(
Explanation:
How many grams are in 5.00 moles of sodium carbonate?
Answer:
530 g
Explanation:
1 mole of Sodium Carbonate = 106g
5 moles = 106*5 = 530g
Select all 3 of thy chemical properties below:
A Malleable
B Flammable
c Ductile
D Toxicity
E Density
F Oxidation
G Boiling/Melting Point
Answer:
B.
F.
Explanation:
write chemical equation of zinc granule
The carbon atoms in cellulose found in a log originally came from _____ absorbed by the plant. Group of answer choices
Answer: Your answer is carbon dioxide in the air
Hope this helps!