Question

1. Rank the following in order of increasing mass: 1.0 mole of methane (CH4), 0.50 mole of water (H2O), 0.20 mole of Fe, and 0.010 mole of U.

2. When heated, calcium carbonate (limestone) undergoes a decomposition reaction. Write a balanced equation for this reaction.

Answer 1

Answer or According to mole concept 1) Imole methane (CH) mass is 16 g/mol 2) Imole water (H₂O) = 18 8/mol mass is 0.5 mole of water = 1880.5 = 9 g/mol. 3) Imole fe mass = 55.845 81 mol B. 20 moles of femass - 0.20x55.845 =11.169 91mol i mole of u mass = 238 g/mol 0.010 moles of Umass = 0.010 *238 = 2038 gimo 1 increasing order in mass un hok Fek CHu ooolmole 0.5 0.20 Imole mole mole

| 8 Ca Co Cao + Co, (s) ) calcium carbonate on decomposition gives Calcium oxide (cao) and oxygen gas.