The concentration of a hydrochloric acid solution is 0.5mol/dm3.

Question

How many moles of hydrochloric acid are present in 25cm3 of this solution?
A) 0.0125
B) 0.0200
C) 12.5
D) 20.0

Answer 1

25cm^3 * 0.5mol/1000cm^3 = 12.5/1000 = 0.0125 mole

Answer 2

0.0125

Answer 3

D)20

Answer 4

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Answer 5

0.001 x 25 = 0.025 (conversion from cm3 to dm3)
mole = concentration x volume (solutions)
0.025 x 0.5 = 0.0125