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
• B. 33.78 gm
• C. 53.68 gm
• D. 23.78 gm

Answer 1

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