Write complete balanced equations for the following reactions:
(a) Calcium (solid) +Water (liquid) 
Calcium hydroxide (solution) +Hydrogen (gas)
(b) Sulphur dioxide (gas)+ Oxygen (gas)
Sulphur trioxide (gas)
(a) Ca (s) + 2H20 (l) 
Ca(OH)2 (aq) + H2 (g)
Calcium will react with 2 moles of water.
(b) 2S02 (g) + 02 (g) 
2S03 (g)
2 moles of Sulphur dioxide and oxygen to give 2 moles of Sulphur trioxide.
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