Question

Calculate the mass in grams for the following: (a) 0.6 mol of hydrogen peroxide. (b) 0.15 mol 0f ammonia gas​

Answer 1

Number of moles = mass / molar mass

(a) 0.6 mol of hydrogen peroxide :-

Hydrogen peroxide => H2O2

Number of moles = 0.6

Mass = ?

Molar mass of Hydrogen = 1 g/mol

Molar mass of Oxygen = 16 g/mol

Molar mass of H2O2 = 1*2 + 16*2 = 2 + 32 = 34 g/mol

0.6 = mass / 34

mass of H2O2 = 34*0.6 = 20.4 g

(b) 0.15 mol 0f ammonia gas​ :

Ammonia => NH3

Number of moles = 0.15

Mass = ?

Molar mass of Hydrogen = 1 g/mol

Molar mass of Nitrogen = 28 g/mol

Molar mass of NH3 = 28 + 1*3 = 31 g/mol

0.15 = mass / 31

mass of NH3 = 31*0.15 = 4.65 g

:-)