SECTION
Q.14 Write down the chemical formula of sodium oxide and find its molecular
mass (Atomic mass of Na=234, 0=164)
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Formula unit mass of ZnO=(Atomic mass of Zn)+(Atomic mass of O)
=(65+16)u =81u
Formula unit mass of Na2
O=(2×23)+16
=62u
Formula unit mass of K 2
CO3
=(2×39)+12+(3×16)
=138u
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