BMST - Basic Math and Science Chemical Reactions and Stoichiometry Questions and Answers 3

Question 1

In the reaction 2H₂ + O₂ → 2H₂O, how many moles of water are produced from 4 moles of H₂?

Accepted Answer

4 moles

Answer

The molar ratio of H₂ to H₂O is 1:1, so 4 moles of H₂ produces 4 moles of H₂O.

Question 2

Which type of chemical reaction involves a single compound breaking down into two or more simpler substances?

Accepted Answer

Decomposition

Answer

Decomposition reactions break one compound into two or more simpler substances (e.g., 2H₂O → 2H₂ + O₂).

Question 3

What is the molar mass of glucose (C₆H₁₂O₆)?

Accepted Answer

180 g/mol

Answer

Molar mass = 6(12) + 12(1) + 6(16) = 72 + 12 + 96 = 180 g/mol.

Question 4

In a double replacement reaction between NaCl and AgNO₃, which precipitate forms?

Accepted Answer

AgCl

Answer

AgCl is insoluble in water and precipitates out of solution in this double replacement reaction.

Question 5

How many grams of CO₂ (molar mass 44 g/mol) are produced when 0.5 moles of CO₂ are generated?

Accepted Answer

22 g

Answer

Mass = moles × molar mass = 0.5 mol × 44 g/mol = 22 g.

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