What mass of CO₂ will be produced when 50 g of CaCO₃ decomposes?

If a solution of NaOH is 0.1 mol/dm³, what is its concentration in g/dm³?

What is the empirical formula for hydrogen peroxide which has a molecular formula of H₂O₂?

The empirical formula for a compound is CH₂ and its relative atomic mass (A_r) is 70. What is its molecular formula? Use the periodic table to help you.

If 2.8 g of nitrogen combines with 6.4 g of oxygen, what is the empirical formula of the nitrogen oxide formed? Use the periodic table to help you.

What is the percentage yield if the actual yield was 2.4 g and the predicted yield was 3.0 g?

What mass of cobalt must have reacted if 3.20 g of oxygen forms 7.92 g of cobalt oxide?

What is the concentration of a solution formed by dissolving 4 g of potassium hydroxide in 200 cm³ of water?

If 24 g of magnesium reacts with 16 g of oxygen to produce 40 g of magnesium oxide, what mass of magnesium would you need to start with to produce 10 g of magnesium oxide?