Question

Express the following into grams:

(i) 0.7 moles of H2O

(ii) 4.0 moles of HNO3

(iii) 3.77 mole of HCl

(iv) 8.75 mole of CaSO4​

Answer 1

0.7 moles of H₂O:-

•Given number of moles = 0.7

Molar mass of H₂O:-

= 1×2+16

= 18g

=>Mass = No of moles×Molar mass

=>Mass = 0.7×18

=>Mass = 12.6g

4.0 moles of HNO₃:-

•Given number of moles = 4.0 or 4

Molar mass of HNO₃:-

= 1+14+16×3

= 63g

=>Mass = No of moles×Molar mass

=>Mass = 4×63

=>Mass = 252g

3.77 moles of HCl:-

•Given number of moles = 3.77

Molar mass of HCl:-

= 1+35.5

= 36.5g

=>Mass = No of moles×Molar mass

=>Mass = 3.77×36.5

=>Mass = 137.605g

8.75 moles of CaSO₄:-

•Given number of moles = 8.75

Molar mass of CaSO₄:-

= 40+32+16×4

= 136g

=>Mass = No of moles×Molar mass

=>Mass = 8.75×136

=>Mass = 1190g