Question

प्रश्न 3 शुद्ध जल की मोललता ज्ञात कीजिए H20 = 18 ।​

Answer 1

Answer:

Answer: 55.5 M

Explanation: As we know Density of pure water is = 1 g/ml

That means 1 gram of water is dissolved in 1 ml of solution.

Molarity : It is defined as the number of moles of solute present per Liter of solution.

Formula used :

Molarity=\frac{n\times 1000}{V_s}Molarity=

V

s

n×1000

where,

n= moles of solute

Moles=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{1g}{18g/mol}=0.055molesMoles=

Molar mass

Given mass

=

18g/mol

1g

=0.055moles

V_sV

s

= Volume of solution in ml

Molarity=\frac{0.0555\times 1000}{1ml}Molarity=

1ml

0.0555×1000

Molarity=55.5MMolarity=55.5M