What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution?
[Na=23, O=16, H=1]
A.
0.05 moldm-3
B.
0.30 moldm-3
C.
0.50 moldm-3
D.
0.40 moldm-3
Correct answer is C
2g NaOH is contained in 100cm3
Xg NaOH is contained in 1000cm3
Xgram = \(\frac{2\times 1000}{100}\) = 20g
Mole = \(\frac{20}{40}\) = 0.50mol/dm3
