The molar mass of NH3 is 17.03 g/mol. The molar mass of H2 is 2.0158 g/mol. In a particular reaction, 0.575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures?
Answers
The balanced chemical reaction is:
N2 + 3H2 = 2NH3
We are given the amount of ammonia formed from the reaction. This is where we start our calculations.
0.575 g NH3 (1 mol NH3 / 17.03 g NH3) (3 mol H2 / 2 mol NH3) ( 2.02 g H2 / 1 mol H2) = 0.10 g H2
Answer:
Answer is 0.102.
Explanation:
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Answers
There are approximately 4.52 x 10^23 atoms in 0.750 moles of zinc.
How to find the number of atoms
To determine the number of atoms in a given amount of a substance, you can use Avogadro's number, which is approximately 6.022 x 10^23 atoms/mol.
Given that you have 0.750 moles of zinc, you can calculate the number of atoms using the following steps:
Multiply the given number of moles by Avogadro's number:
0.750 moles * (6.022 x 10^23 atoms/mol) = 4.5165 x 10^23 atoms
Round the result to an appropriate number of significant figures:
Since the value given has three significant figures, the final answer should be rounded accordingly. Therefore, the number of atoms in 0.750 moles of zinc is approximately 4.52 x 10^23 atoms.
So, there are approximately 4.52 x 10^23 atoms in 0.750 moles of zinc.
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It is
Answers
Mass = moles x RFM
(RFM = Relative Formula Mass, or the total mass of a substance or element for example Cu=64)
Rearrange the formula to find the number of moles
Moles = mass/RFM
=6.4/64
= 0.1
Answers
Answer:
The physical process of evaporation involves (1) addition of heat energy and (2) increase in entropy
Explanation:
During evaporation, liquid molecules convert into gas molecules. As gas molecules has negligible intermolecular force as compared to liquid molecules therefore heat energy has to be applied to separate liquid molecules by breaking intermolecular force and convert them into gas
Again, gas molecules are free to move. Hence they possesses more degrees of freedom. Therefore gas molecules have higher entropy than liquid molecules. So entropy increases during evaporation.
When anything turns from a liquid to a gas, evaporation occurs. Water evaporates when it is heated. The molecules move and vibrate at such a rapid rate that they release water vapour molecules into the atmosphere. The physical process of evaporation involves an increase in entropy .
Liquid molecules change into gas molecules during evaporation. Since gas molecules have a far lower intermolecular force than liquid molecules, heat energy must be used to dissolve the bonds between liquid molecules and turn them into gas.
Gas molecules can travel freely once more. As a result, they have more degrees of freedom. As a result, the entropy of gas molecules is larger than that of liquid molecules. As a result, entropy grows during evaporation.
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IT
Answers
Answer:
Fossils: 3.5 billion. Rocks: 4.28 billion
they were found during Haden Eon
Explanation:
b. It would have six electrons in the innermost shell.
c. It would have eight electrons in the outermost shell.
d. It would have eight electrons in the innermost shell.
Answers
oxygen atomic number is 8.
electron configuration of O is 2,6
therefore O has 6 valence electrons. valence electrons are electrons in the outermost shell that are involved in chemical bonds
atoms to become stable should fulfill the octet rule. This is where the outermost shell should have 8 electrons
so atoms with incompletely filled outer shells take part in chemical bonds to gain a complete octet and to become stable
So O too after forming a chemical bond would have 8 electrons in the outermost shell.
correct answer is
c. It would have eight electrons in the outermost shell.
Answer: I know I'm too late but for all you people that have an exam it is C.
Explanation:
a. True
b. False
Answers
Answer : The correct option is, (a) true
Explanation :
Ozone layer : It is a layer which is present in the stratosphere region. Ozone layer is the layer which absorbs more amount of the ultraviolet rays which is the more harmful rays for us. That means ozone layer protect us from the harmful rays (UV rays). Ultraviolet rays causes the skin cancer. When the ultraviolet rays reaches directly to the earth, it cause many type of diseases.
When the hole in the ozone layer then it can lead to increases in skin cancer.
Hence, the given statement is true.