## Question

### Solution

Correct option is

14.29 %.

Molecular formula of ammonium dichromate is (NH4)2 Cr2O7

Mol. Mass of (NH4)2 Cr2O7 No. of parts by mass of cation viz   = 14.29 %.

#### SIMILAR QUESTIONS

Q1

4.90 g of KClO3 when heated produced 1.92 g of oxygen and the residue (KCl) left behind weight 2.96 g. Show that these results illustrate the law of conservation of mass.

Q2

Chlorine has two isotopes of atomic mass units 34.97 and 36.97. The relative abundances of these two isotopes are 0.755 and 0.245 respectively. Find the average atomic mass of chlorine.

Q3

Calculate the molecular mass of glucose (C6H12O6)molecule.

Q4

A solution is prepared by adding 2 g of a substance A to 18 g of water. Calculate the mass percent of the solute.

Q5

The density of 3 M solution of NaCl is 1.25 g mL–1. Calculate the molalityof the solution.

Q6

How many grams of NaOH should be dissolved to make 100 cm–3 of 0.15 M NaOH solution?

Q7

Calculate the number of oxalic acid molecules in 100mL of 0.02 N oxalic acid solution

Q8

Calculate the molarity of water if its density is 100 kg/m3

Q9

Calculate the percentage of water of crystallisation in the sample of blue vitriol (CuSO4.5H2O)

Q10

Calculate the mass of sodium acetate (CH3COONa) required to make500mL of 0.375 molar aqueous solution. Molar mass of sodium acetate is 82.0245 g mol–1