Calculat the relative molecular masses of :
(a) Ammonium chloroplatinate $(N H_{4})_{2} P t C l_{6}$
(b) Potassium chlorate,
(c) $C u S O_{4} . 5 H_{2} O,$
(d) $(N H_{4})_{2} S O_{4}$ (e) $C H_{3} C O O N a,$ (f) $C H C l_{3}$
(g) $(N H_{4})_{2} C r_{2} O_{7}$ .

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Solution

(a) $(2 N = 28) + (8 H = 8) + (P t = 195) + (6 C l = 35.5 x 6) = 444$

(b) $(K = 39) + (C l = 35.5) + (3 O = 48) = 122.5$

(c) $(C u = 63.5) + (S = 32) + (4 O = 64) + (5 H_{2} O = 5 \times 18) = 249.5$

(d) $(2 N = 28) + (8 H = 8) + (S = 32) + (4 O = 64) = 132$

(e) $(C = 12) + (3 H = 3) + (C = 12) + (2 O = 32) + (N a = 23) = 82$

(f) $(C = 12) + (H = 1) + (3 C l = 3 \times 35.5) = 119.5$

(g) $(2 N = 28) + (8 H = 8) + (2 C r = 2 \times 51.9) + (7 O = 7 \times 16) = 252$

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Similar questions

Calculate the relative molecular masses of :

(a) $C H C l_{3}$ (b) $(N H_{4})_{2} C r_{2} O_{7}$

(e) $C H_{3} C O O N a$ (f) Potassium chlorate

(g) Ammonium chloroplatinate $(N H_{4})_{2} P t C l_{6}$

Calculate the relative molecular masses of (Use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S = 32)
(a) potassium chlorate
(b) sodium acetate
(c) chloroform
(d) ammonium sulphate

Q. Calculate the relative molecular masses of:

(N H_{4})_{2} S O_{4}

Define or explain the terms:
(a) Vapour density,

(b) Molar volume,
(c) relative atomic mass,

(d) relative molecular mass,
(e) Avogadro's number,

(f) Gram atom,
(g) Mole.

Define the terms:
(a) vapour density
(b) molar volume
(c) relative atomic mass
(d) Avogadro's number
(e) relative molecular mass

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Calculat the relative molecular masses of : (a) Ammonium chloroplatinate(NH4)2PtCl6 (b) Potassium chlorate, (c) CuSO4.5H2O, (d) (NH4)2SO4 (e) CH3COONa, (f) CHCl3 (g) (NH4)2Cr2O7.

(a) (2N=28)+(8H=8)+(Pt=195)+(6Cl=35.5x6)=444 (b) (K=39)+(Cl=35.5)+(3O=48)=122.5 (c) (Cu=63.5)+(S=32)+(4O=64)+(5H2O=5×18)=249.5 (d) (2N=28)+(8H=8)+(S=32)+(4O=64)=132 (e) (C=12)+(3H=3)+(C=12)+(2O=32)+(Na=23)=82 (f) (C=12)+(H=1)+(3Cl=3×35.5)=119.5 (g) (2N=28)+(8H=8)+(2Cr=2×51.9)+(7O=7×16)=252

Calculat the relative molecular masses of :
(a) Ammonium chloroplatinate $(N H_{4})_{2} P t C l_{6}$
(b) Potassium chlorate,
(c) $C u S O_{4} . 5 H_{2} O,$
(d) $(N H_{4})_{2} S O_{4}$ (e) $C H_{3} C O O N a,$ (f) $C H C l_{3}$
(g) $(N H_{4})_{2} C r_{2} O_{7}$ .