31) a) Define molecular mass of a substance.
Find relative molecular mass of 1)cacl2
2)HNo3
(given ca=40u cl=35.5u H=1u N=14u O=16u)
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Answer:
Relative molecular mass of Cacl2
=40+35.5×2
=111u
Relative molecular mass of HNO3
=1+14+16×3
=634
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