JAMB - Chemistry (1982 - No. 45)
The number of grammes of potassium hydroxide in 250cm3 of one molar solution is?
(K = 39, O = 16, H = 1)
(K = 39, O = 16, H = 1)
40g
52g
100g
26g
14g
Vysvětlení
1000 cm3 of KOH contains 56 gm of KOH
250 cm3
of 1M KOH will contain (250)/(1000) x (56)/(1) = 14gms
250 cm3
of 1M KOH will contain (250)/(1000) x (56)/(1) = 14gms