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Question

If one mole of sodium phosphate is equal to molecular mass of sodium phosphate. Then what us the mass of 0.145 mol of sodium phosphate. (Na = 23 amu, P = 31 amu, O = 16 amu)


A

43.6 gm

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B

33.78 gm

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C

53.68 gm

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D

23.78 gm

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Solution

The correct option is D

23.78 gm


1 mol = molar mass of compound

= 23 x 3 + 31 + 16 x 4

= 164 gm

0.145 mol will have = 164 x 0.145

= 23.78 gm


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