Question

find the molarity of a solution prepared by dissolving 7.1 gram of N a2 S o4 in hundred ml of H2O​

Answer 1

Hi there,

Given:

Sample mass =7.1g

Volume = 100 ml

☆Mwt of Na2SO4= 23×2+32+16×4=142g

☆Number of moles = ms ÷ mwt =7.1÷142= 0.05 mol

☆To calculate molarity equal number of moles ÷ volume in litre

☆M= n÷v= 0.05 ÷ 0.1 = 0.5 mol/l

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Answer 2

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