Question

Вычислите массовые доли элементов в процессах по формулам:1)СuSO4. 2)Fe2O3. 3)HNO3.

Answer 1

Mr(CuSO4) = 63,5 + 32 + 16*4 = 159,5
W(Cu) = Ar(Cu)* n / Mr(CuSO4) *100% = 63,5 *1 / 159,5 *100% = 40%
W(S) = Ar(S) *n / Mr(CuSO4) *100% = 32*1 / 159,5 *100% = 20%
W(O) = Ar(O) * n / Mr(CuSO4) *100% = 16 * 4 / 159,5 *100% = 40%
Mr(Fe2O3) = 56*2 + 16*3 = 160
W(Fe) = Ar(Fe) * n / Mr(Fe2O3) *100% = 56 *2 / 160 *100% = 70%
W(O) = Ar(O) *n / Mr(Fe2O3) *100% = 16*3 / 160 * 100% = 30%
Mr(HNO3) = 1 + 14 + 16*3 = 63
W(H) = Ar(H) *n / Mr(HNO3) *100% = 1 *1 / 63 *100% = 1,6%
W(N) = Ar(N) * n / Mr(HNO3) *100% = 14 *1 / 63 *100% = 22%
W(O) = Ar(O) *n / Mr(HNO3) * 100% = 16 * 3 / 63 *100% = 76%

Answer 2

Calculating the Mass Percent of Elements in Compounds

1. Copper(II) sulfate (CuSO4): - The molar mass of CuSO4 is 159.609 g/mol. - The molar mass of Cu in CuSO4 is 63.546 g/mol. - The molar mass of S in CuSO4 is 32.065 g/mol. - The molar mass of O in CuSO4 is 15.999 g/mol. - To calculate the mass percent of each element: - Copper (Cu): (63.546 g/mol / 159.609 g/mol) * 100% = 39.81% - Sulfur (S): (32.065 g/mol / 159.609 g/mol) * 100% = 20.07% - Oxygen (O): (15.999 g/mol / 159.609 g/mol) * 100% = 40.12%.

2. Iron(III) oxide (Fe2O3): - The molar mass of Fe2O3 is 159.688 g/mol. - The molar mass of Fe in Fe2O3 is 55.845 g/mol. - The molar mass of O in Fe2O3 is 15.999 g/mol. - To calculate the mass percent of each element: - Iron (Fe): (2 * 55.845 g/mol / 159.688 g/mol) * 100% = 69.94% - Oxygen (O): (3 * 15.999 g/mol / 159.688 g/mol) * 100% = 30.06%.

3. Nitric acid (HNO3): - The molar mass of HNO3 is 63.012 g/mol. - The molar mass of H in HNO3 is 1.008 g/mol. - The molar mass of N in HNO3 is 14.007 g/mol. - The molar mass of O in HNO3 is 15.999 g/mol. - To calculate the mass percent of each element: - Hydrogen (H): (1.008 g/mol / 63.012 g/mol) * 100% = 1.60% - Nitrogen (N): (14.007 g/mol / 63.012 g/mol) * 100% = 22.24% - Oxygen (O): (3 * 15.999 g/mol / 63.012 g/mol) * 100% = 76.16%.

These calculations provide the mass percentages of the elements in the given compounds.