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What mass of potassium hydrogencarbonate is needed to make 100 g of potassium carbonate on thermal decomposition?
The equation for this reaction is:
|
2KHCO3(s) ⇒ K2CO3(s) + H2O(l) + CO2(g) |
K2CO3 = 138
\ number of moles of K2CO3 = 100/138 = 0.7246 mol
2KHCO3 º K2CO3
\ number of moles of KHCO3 = 2 × 0.7246 = 1.45 mol
KHCO3 = 100
\ mass of KHCO3 = 1.45 × 100 = 145 g