Question

present cobalt.
e Formula of iron (III) oxide is Feo.
12. Calculate the relative molecular masses of :
(a) CHCIZ
(b) (NH2)2 Cr,O
(c) CuSO4.5H2O (d) (NH2)2SO4
(e) CH, COONa
(f) Potassium chlorate
(g) Ammonium chloroplatinate (NH.) 2 PtCl6
2.
th
CE
13. Give the empirical formula of:
(a) Benzene (CH) (b) Glucose (CH,206)
c) Acetylene (C2H2) (d) Acetic acid (CH2COOH)
14. Find the percentage mass of water in Epsom salt MgSO47H,O.
15. Calculate the percentage of phosphorus in:
(a) Calcium hydrogen phosphate Ca(H PO 22
(b) Calcium phosphate Ca,(PO2)2
16. Calculate the percentage composition of each element in Potassium chlorate, KCIOZ.
17. Urea is a very important nitrogenous fertilizer. Its formula is CON H. Calculate the percentage of carbon in urez
(C = 12,0 = 16, N = 14 and H= 1)
ANSWERS
9. (b) (i) 332 (ii) 96 (iii) 60 (iv) 100
[At. mass : C = 12, H = 1,0= 16, Cl = 35.5, N = 14, Cu = 63.5, S = 32, Na = 23, K = 39, Pt = 195, Ca = 40, P=313​

Answer 1

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Answer 2

Answer:

present cobalt.

e Formula of iron (III) oxide is Feo.

12. Calculate the relative molecular masses of :

(a) CHCIZ

(b) (NH2)2 Cr,O

(c) CuSO4.5H2O (d) (NH2)2SO4

(e) CH, COONa

(f) Potassium chlorate

(g) Ammonium chloroplatinate (NH.) 2 PtCl6

2.

th

CE

13. Give the empirical formula of:

(a) Benzene (CH) (b) Glucose (CH,206)

c) Acetylene (C2H2) (d) Acetic acid (CH2COOH)

14. Find the percentage mass of water in Epsom salt MgSO47H,O.

15. Calculate the percentage of phosphorus in:

(a) Calcium hydrogen phosphate Ca(H PO 22

(b) Calcium phosphate Ca,(PO2)2

16. Calculate the percentage composition of each element in Potassium chlorate, KCIOZ.

17. Urea is a very important nitrogenous fertilizer. Its formula is CON H. Calculate the percentage of carbon in urez

(C = 12,0 = 16, N = 14 and H= 1)

ANSWERS

9. (b) (i) 332 (ii) 96 (iii) 60 (iv) 100

[At. mass : C = 12, H = 1,0= 16, Cl = 35.5, N = 14, Cu = 63.5, S = 32, Na = 23, K = 39, Pt = 195, Ca = 40, P=313