Question

1:

If 30.4 g of H₂S is reacted with 30. 4 g of SO₂ in the following balanced reaction, which species is the limiting reactant?

2 H₂S + SO₂  ⟶   2 H₂O + 3 S The molar mass of H₂S is 34.082 g/mol and the molar mass of  SO₂ is 64.065 g/mol.

A: SO₂

B: S

C: H₂O

D: There is none.

E: H2s

2:

John was sloppy when doing an experiment in the lab. His actual yield of product for a reaction was 15.4 grams. He calculates his percent yield as 32.2%. How many grams of product could he have made, theoretically?

A: 15.4 g

B: 24.1 g

C: 99.3 g

D: 47.8 g

E: 32.2 g

3: The reaction, Mg (s) + 2H₂O (l) ⟶ Mg(OH)₂ (s) + H₂ (g), has a heat of reaction of - 84.3 kcal/mol. By this reaction, how many grams of Mg powder produces 780.0 kcal of heat? The molar mass of Mg is 24.3050 g/mol.

A: 18.6 g

B: 254 g

C: 225 g

D: 807 g

E:143 g

Answer 1

225 g of mg powder will produce