please help with this need it in 6 hours
1.)in the thermit reaction 2Al + Fe2o3= al2o3 + 2 fe. what is the mass of aluminium powder is needed to react with 8.0g of iron (3) oxide
2.) what mass of magnesium sulphate crystals can be made from14.0g of magnesium carbonate and an excess of dilute sulphuric acid
3.) what mass of calcium oxide is formed when 25g of calcium carbonate is decomposed by heat?
4.) Lead (ii) oxide PbO, reacts with hydrogen to for lead and steam. calculate the mass of lead in formed when 446g of lead (ii) oxide is reduced in this way.
5.) what volume of gas is given off when excess calcium carbonate is added to 50cm cube of 2.0M by hydrochloric acid , if the gas volume is measured at s.t.p.?