# Calculate the mol

Molarity is the concentration of a solution expressed as the number of moles of solute per litre of solution.

Molarity = (a) Given,

In 4.3 L of solution there is 30 g of Co(NO3)2. 6H2O

Molar mass of Co(NO3)2.6H2O = (1 × 59 + 2 × (1 × 14 + 3 × 16) + 6 × 18)

= 291 g/mol.

Moles  = = 0.103 mol.

Now, Molarity = = 0.023 M

(b) Given,

30 mL of 0.5 M H2SO4 diluted to500 mL.

Applying the formula,

M1V1 = M2V2

where, M1 = 0.5 M
V1 = 30 ml
M2 = ?
V2 = 500 ml

⇒0.5M × 30 ml = M2 × 500 ml

so,M2= 0.03 M.

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