Question

Find the mass of Na2CO3 which will have the same number of molecules as in 12.3 gm of MgSO4.7H2O

Answer 1

Answer:

Number of molecules =(12•3/246)×6•022×10²³

0•05×6•022×10²³

0•3011×10²³

mass=(106×3•01)/60•22

319•06/60•22

5•29

5•3

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Answer 2

Answer:

Molecular mass of MgSO4. 7H2O is 24+32+64+7(18)=246 gram. No of moles= 12.3/246=0.05moles. As per the question moles of Na2CO3 is 0.05 moles.

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