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sorry bro I don't know what is the answer for it
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7 - (c) Lavoisier
9- (a) NaHCO3
10-Sodium sulphate is Na2SO4
Molecular mass is 2(23)+32+4(16) = 142u
11- (d) Br2
12-(a) Law of Constant proportion states that a chemical compound always contains exactly the same proportion of elements by mass.
(c) The postulate of Dalton's atomic theory resulting from the law of conservation of mass is ' The relative number and kinds of atoms are constant in a given compound. Atoms cannot be created nor destroyed in a chemical reaction.'
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