sodium nitrate → NaNO3 → MM is 84.99 g/mol
ammonium sulfate → (NH4)3SO4 → MM is 150.18 g/mol
Calculating the amount of N per $. For NaNO3:
The nitrogen in sodium nitrate and in ammonium sulfate is available to plants as fertilizer. Which is the more economical source of nitrogen, a fertilizer containing 30.0% sodium nitrate by weight and costing $9.00 per 100 lb or one containing 20.0% ammonium sulfate by weight and costing $8.10 per 100 lb.
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Based on our data, we think this problem is relevant for Professor Kahvand's class at City Colleges of Chicago-Richard J Daley College.