Write the formulas for the fertilizers below. Calculate the mass fraction of nitrogen in each of them.

| August 10, 2021 | education

Write the formulas for the fertilizers below. Calculate the mass fraction of nitrogen in each of them. a) Sodium nitrate b) Ammonium nitrate c) Ammonium sulfate It is very necessary, help.

a) Sodium nitrate NaNO3
Expression for determining the mass fraction of an element in a substance:
W = M (el-t) * 100% / M (in-in)
M (NaNO3) = 23 + 14 + 16 * 3 = 85 g / mol
M (N) = 14 g / mol
W = M (el-t) * 100% / M (in-in) = 14 * 100/85 = 16.5%

b) Ammonium nitrate NH4NO3
M (NH4NO3) = 14 + 4 * 1 + 14 + 16 * 3 = 80 g / mol
M (N) = 2 * 14 = 28 g / mol
W = M (el-t) * 100% / M (in-in) = 28 * 100/80 = 35%

c) Ammonium sulfate (NH4) 2SO4
M ((NH4) 2SO4) = (14 + 1 * 2) * 2 + 32 + 16 * 4 = 128 g / mol
M (N) = 2 * 14 = 28 g / mol
W = M (el-t) * 100% / M (in-in) = 28 * 100/128 = 21.8%

Answer: the nitrogen content, respectively, according to the options: a) 16.5%, b) 35%, c) 21.8%.



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