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Answers
Answer:
Ques 4
1.Cr2(SO4)2
2.K HCO3
Ques 5
1.2H2S + SO2 -----> 3S +4H2O
Ques 6
Ca(OH)2 +NH4 Cl ----> CaCl2 + NH4OH
Fe + 2HCL-----> FeCl2 + H2
Ques 7
Nitric Acid Formula = HNO3
Molar mass of Hydrogen = 1
Molar mass of Nitrogen = 14
Molar mass of Oxygen = 16
To Find:
The mass percentage of the elements in nitric acid.
Formula that is used for calculating mass percentage of an element:
= Mass of The Element / total mass of the compound x 100
Calculating:
Calculating total mass of HNO3
= 1 x 1 + 14 x 1 + 16 x 3
= 1 + 14 + 48
= 63
Calculating the mass percentage of Nitrogen in HNO3
= 1/63 x 100
= 1.586 %
Therefore, the percentage of Nitrogen in HNO3 is 1.596 %
Calculating the mass percentage of Oxygen in HNO3
= 48/63 x 100
= 76.19 %
Therefore, the mass percentage of Oxygen in HNO3 is 76.19 %
Calculating the mass percentage of Nitrogen in HNO3
= 14 / 63 x 100
= 22.22 %
Therefore, the mass percentage of Nitrogen in HNO3 is 22.22 %