Stoichiometric Calculations

Which of the statements about mole ratios are true? Select all that apply.

• Mole ratios can only be formed between two products.

• Mole ratios can be formed between any combination of reactants and/or products.

• Mole ratios include coefficients from a balanced chemical equation.

• Mole ratios do not include stoichiometric coefficients.

• Mole ratios can only be formed between two reactants.

Tags

NGSS.HS-PS1-7

Consider the chemical equation for the combustion of ammonia: 4NH₃(g) + 7O₂(g) → 4NO₂(g) + 6H₂O(g) Which statement(s) provides the correct and standard interpretation of the chemical equation in terms of the volume of gases at STP? Select all that apply.

• A. 4 L of NH₃(g) react with 7 L of O₂(g) to produce 4 L of NO₂(g) and 6 L of H₂O(g).

• B. 12 L of NH₃(g) react with 14 L of O₂(g) to produce 8 L of NO₂(g) and 6 L of H₂O(g).

• C. 22.4 L of NH₃(g) react with 22.4 L of O₂(g) to produce 22.4 L of NO₂(g) and 22.4 L of H₂O(g).

• D. 89.6 L of NH₃(g) react with 156.8 L of O₂(g) to produce 89.6 L of NO₂(g) and 134.4 L of H₂O(g).

• 1.3 liters

• 3.7 liters

• 7.4 liters

• 9.3 liters

Tags

NGSS.HS-PS1-7

A group of food scientists are developing a new line of seasonings that are low in salt (NaCl). As part of their research, they synthesized a batch of salt by reacting sodium (Na) and chlorine (Cl2) according to the given reaction:

2Na (s) + Cl₂ (g) --> 2NaCl (s)

If scientists add 3.2 moles of Cl₂ to Na. Determine the number of moles and formula units of NaCl are produced.

Tags

NGSS.HS-PS1-7

Which of the given mole ratios are possible for the salt formation equation? Select three that apply.

2Na (s) + Cl₂ (g) --> 2NaCl (s)

• 2 Na : 1Cl₂

• 1 Cl₂ : 2NaCl

• 1 Cl₂ : 2NaCl

• 1 Na : 1 Cl₂

• 1 Na₂ : 1NaCl