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What weight of NaCl is needed to make 2.0 dm3 of ...

What weight of NaCl is needed to make 2.0 dm3 of a 1.5M solution?
[Na = 23, Cl = 35.5]

A.

116 g

B.

175 g

C.

87 g

D.

58 g

View answer & explanation

Correct answer is B

Molar mass of Nacl = 23 + 35.5 = 58.5 g/mol
Number of moles of Nacl = conc. in mol/dm3
x vol. in dm3
= 1.5 * 2.0 = 3.0 moles
1 mole of NaCl has a weight of 58.5 * 3
= 175.5g

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