Question

1. calculate the molecular mass of ch2cl2, washing soda, green vitriol, and sodium sulphate.
2. what do you mean by the term ‘chemical formula’?
3. define relative atomic mass. name the element which is taken as reference atom for calculating relative atomic mass.
4. calculate the no. of molecules of sulphur present in 16 g of solid sulphur. [s=32]
5. write names of the following, fe2s3,ca3(po4)2, fe2(so4)3.
6. give the names of the ions present in (nh4)2so4, ca(oh)2

Answer 1

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Answer 2

Answer: of ch2cl2 it is 85

For Na2so3 it is

Explanation:

12 + (1*2) +(35.5*2)

That is equal to 85

(23*2) + ((32 + (16*3)))

That is equal to 126