Question

7 * 10 * (-18) evaluate?​

Answer 1

Step-by-step explanation:

ICSE Selina Solution for Class 9 Chemistry Chapter 1 The Language of Chemistry

(ii)Fe(SO.)3

(iii)Fe(SO4)3

(iv)FeSO4

(d)In water, the hydrogen-to-oxygen mass ratio is

(i)1:8

(ii)1:16

(iii)1:32

(iv)1:64

(e)The formula of sodium carbonate is Na, CO,and that of calcium hydrogen carbonate is

(i)CaHCO3

(ii)Ca(HCO3)2

(iii)Ca,HCO3

(iv)Ca(HCO)3

Solution:

a) Answer is (iii) Berzelius

b) Answer is (i) One

c) Answer is (iii) Fe2(SO4)3

d) Answer is (i)1: 8

e) Answer is (ii) Ca(HCO3)2

11.Correct the following statements

(a)A molecular formula represents an element.

(b)Molecular formula of water is H202.

(c)A molecule of sulphur is monoatomic.

(d)CO and Co both represent cobalt.

(e)Formula of iron(III)oxide is FeO.

Solution:

a) Molecular formula represents molecule of an element or a compound.

b) Molecular formula of water is H20

c) A molecule of sulphur is diatomic.

d) CO represents carbon monoxide and Co represent cobalt.

e) Formula of iron(III)oxide is Fe2O3.

12.Calculate the relative molecular masses of:

(a)CHCI3

(b)(NH4)2Cr2O7

(c)CuSO4.5H2O

(d)(NH4)2SO4

(e)CH3COONa

(f)Potassium chlorate

(g)Ammonium chloroplatinate(NH4)2PLCl6

[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=31,Mg=24]

Answer 2

Answer:

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