What mass of nitrogen would react with 15 g of hydrogen? Give your answer to 3 s.f.

N₂ + 3H₂ ➔ 2NH₃

(You may need a periodic table)

What mass of carbon dioxide is made when 21.6 g of pentane (C₅H₁₂) burns in oxygen? Give your answer to 3 s.f.

C₅H₁₂ + 8O₂ ➔ 5CO₂ + 6H₂O

(You may need a periodic table)

What mass of chlorine reacts with 32.4 g of aluminium?

2Al + 3Cl₂ ➔ 2AlCl₃

(Give your answer to 3.s.f. You may need a periodic table)

What mass of potassium reacts with 8.0 g of oxygen? Give your answer to 3 s.f.

4K + O₂ ➔ 2K₂O

(You may need a periodic table)

What mass of hydrogen is formed when 4.00 g of magnesium reacts with excess sulfuric acid? Give your answer to 3 s.f.

Mg + H₂SO₄ ➔ MgSO₄ + H₂

(Give your answer to 3 s.f. You may need a periodic table)