O-LevelChemistryStoichiometry5070/12 · May/June 2020 · Q221 Mark
Two fertilisers are made by mixing chemical compounds. Fertiliser X contains 500 g of NH4NO3 and 500 g of (NH4)2SO4 per kilogram. Fertiliser Y contains 700 g of NH4NO3 and 300 g of CaSO4 per kilogram. Which fertiliser contains the higher percentage of nitrogen by mass and which contains the higher percentage of sulfur by mass? [Mr: NH4NO3, 80; (NH4)2SO4, 132; CaSO4, 136]
Afertiliser with higher percentage N: X, fertiliser with higher percentage S: X
Bfertiliser with higher percentage N: X, fertiliser with higher percentage S: Y
Cfertiliser with higher percentage N: Y, fertiliser with higher percentage S: X
Dfertiliser with higher percentage N: Y, fertiliser with higher percentage S: Y
✓ Correct answer
A: fertiliser with higher percentage N: X, fertiliser with higher percentage S: X
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