Question

2.A sample of C₇H₁₃O₃ has a mass of 24.52 grams. What is the percent oxygen in this compound?

3.A compound containing only nitrogen and oxygen is found to be 33.35% nitrogen. Determine the empirical formula of this compound. What is the value of the subscript for oxygen in the formula you calculated?

4.Assume 1.00 mole of hydrogen gas (H₂) reacted in the following equation, using the concept of mole ratio predict the change in the remaining reaction components.

3 B₂Cl₄ + 3 H₂ → 4 BCl₃ + B₂H₆

_5.

Classify each of the following reactions.

2 C2H6(l) + 7 O2(g) ⇄ 4 CO2(g) + 6 H2O(g)

2 H2(g) + O2(g) → 2 H2O(g)    

MgSO4(aq) + Ba(NO3)2(aq) ⇄ Mg(NO3)2(aq) + BaSO4(s)

6.According to the following reaction, how many grams of sodium hydroxide are produced when 0.0597 mol of sodium oxide are consumed? (The molar mass of Na is 22.99; O is 16.00; and H is 1.008 g/mol)

Na₂O _(s) + H₂O _(ℓ) → 2 NaOH _(aq)

_7.According to the following reaction, how many grams of phosphorus are consumed when 17.7g of phosphorus trichloride is formed?

P_{4 (s)} + 6 Cl_{2 (g)} → 4 PCl_{3 (ℓ)}

_8.What is the percent yield of the following reaction which produces 34.5 g of Fe from 68.00 g of Fe₂O₃ and excess Al? The molar mass of Fe is 55.83 g/mol and the molar mass of O is 16.00 g/mol.

Fe₂O_{3 (s)} + 2 Al _(s)  → Al₂O_{3 (s)} + 2 Fe _(s)

Answer 1