26. Sodium carbonate contains 43.4% Na, 11.3% Cand 45.3% O. If the law of constant composition isvalid then weight of Na in 6 g of Na,COa obtainedfrom other source will be3(2) 3.5 g(1) 1.4 g(4) 1.8 g) 2.6 g

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Q. A compound contains 43.4% sodium, 11.3% carbon and 45.3% oxygen.
Determine its empirical formula. (Atomic mass of

N a = 23 C = 12, O = 16

Q. A substance on analysis gave the following percentage composition:

N a = 43.4 %, C = 11.3 %

and

O = 45.3 %

. Calculate the empirical weight (Atomic weight in amu of

N a = 23, C = 12, O = 16

If a compound is made of sodium, carbon, and oxygen and their % composition are 43.4%, 11.3%, 45.3% respectively. What is the chemical formula of the compound?

Q. The percentage by weight of:
a] C in carbon dioxide
b] Na in sodium carbonate
c] AI in aluminium nitride.

are

27 %

43.4 %

65.85 %

respectively
[C=12, O=16, H=1,Na=23, AI=27, N=14]

250 m l

of a sodium carbonate solution contains

2.65

grams of

{N a}_{2} {C O}_{3}

10 m l

of this solution is added to

^{'} x^{'} m l

of water to obtain

0.001 M

{N a}_{2} {C O}_{3}

solution.

What is the value of

^{'} x^{'}

m l

[Molecular weight of

{N a}_{2} {C O}_{3} = 106]

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