What is the relative molecular mass of sodium sulphate? (The relative atomic masses of $N a, S$ and $O$ are $23 u, 32 u$ and $16 u$ respectively)

140

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142

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146

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148

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Solution

The correct option is B 142
Sodium sulphate is $N a_{2} S O_{4}$ . Its relative molecular mass is $2 (23) + 32 + 4 (16) = 142 u$

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Similar questions

Q. (i) Define mole. What are the two things that a mole represents?
(ii) What weight of each element is present 1.5 moles of sodium sulphite, Na₂SO₃? (Atomic masses: Na = 23u; S = 32 u; O = 16 u.)

Q. What is the mass of 5 moles of sodium carbonate (Na₂CO₃) ?
(Atomic masses : Na = 23 u ; C = 12 u ; O = 16 u)

Q. Calculate the formula masses of the following compounds :
(i) Sodium oxide, Na₂O
(ii) Aluminium oxide, Al₂O₃
(Given : Atomic masses : Na = 23 u ; O = 16 u ; Al = 27 u)

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 formula unit masses of

Z n O, N a_{2} O, K_{2} C O_{3}

.
(atomic masses of

Z n = 65 u, N a = 23 u, K = 39 u, C = 12 u

and

O = 16 u

)

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What is the relative molecular mass of sodium sulphate? (The relative atomic masses of Na,S and O are 23u,32u and 16u respectively)

The correct option is B 142Sodium sulphate is Na2SO4. Its relative molecular mass is 2(23)+32+4(16)=142u

What is the relative molecular mass of sodium sulphate? (The relative atomic masses of $N a, S$ and $O$ are $23 u, 32 u$ and $16 u$ respectively)

The correct option is B 142
Sodium sulphate is $N a_{2} S O_{4}$ . Its relative molecular mass is $2 (23) + 32 + 4 (16) = 142 u$