Question

Can you post all the answers for "Specific Mass Conversions Quick Check"

1. How does stoichiometry support the law of conservation of mass?(1 point)
2.Nitrogen gas and hydrogen gas react to produce ammonia according to the following equation.

N2 + 3H2 → 2NH3

Which ratio of components is correct?

Answer 1

#1: The law of conservation of mass underpins the principles of stoichiometry. Because matter cannot be generated or destroyed, the mass of each element present in a chemical reaction's product(s) must be equal to the mass of each element present in the reactant (s).

#2: 3molH2:2molNH3

Step-by-step explanation:

Question 1:

• Stoichiometry allows us to make predictions about the outcomes of chemical reactions. Making useful predictions is one of the main goals of science, the other being the ability to explain phenomena we observe in the natural world.
• According to the Law of Conservation of Mass, in "ordinary" chemical reactions, mass is neither created nor destroyed
• Stoichiometry deals with the chemical quantities of a BALANCED chemical equations.
• The following is an example of an unbalanced equation and we can see why it does NOT follow the law of conservation of mass.
• H2O (l) ⇒ H2 (g) + O2 (g)
• From the equation above, it appears that you begin with 2 hydrogen atoms and form 2 hydrogen atoms. That's just fine. BUT, you cannot begin with 1 oxygen atom and end up with 2 oxygen atoms on the product. This is a violation of the Law of Conservation of Mass.
• Below, you will find the balanced equation for this reaction which DOES follow this law.
• 2 H2O (l) ⇒ 2H2 (g) + O2 (g)
• In the above example, you begin with 4 hydrogen atoms and produce four hydrogen atoms; you start with 2 oxygen atoms and end with 2 oxygen atoms.
• The coefficients needed to balance this chemical equation tell you the ratios that the reactants and products exist in; stoichiometry deals with the quantities of balanced equations.

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Question 2:

• In order to determine the mole ratio, we need to begin with a balanced chemical equation.
• For this reaction the balanced chemical equation is
• N2 + 3H2 ⇒ 2NH3
• The mole ratios are determined using the coefficients of the substances in the balanced chemical equation.
• 1 moln: 3mol2 : 2molNH3
• The mole ratios for each substance pair would be
• 1molN2: 3molH2
• 1molH2/3molH2 or 3molH2/1molN2
• 1molN2:2molNH3
• 1molN2/2molNH3 or 2molNH3/1molN2
• 3molH2:2molNH3
• 3molH2/2molNH3 or 2molNH3/3molH2