What is the number of moles of NaHCO3in 250cm3 of its sol...
What is the number of moles of NaHCO3in 250cm3 of its solution if the solution contains 8.4 g of NaHCO3 in 1 dm3 of the solution. [Na = 23, 0 = 16, C = 12, H = 1)
1
0.25
0.05
0.025
0.01
Correct answer is D
no of mole in 250cm3 of its solution is about molar concentration.
using n = cv
c = nv
where c = molar concentration, n = number of moles and v = volume in dm3
number of mole of NaHCO3 = mass of NaHCO3 / molar mass of NaHCO3 = 8.484 = 0.1moles
but v = 250cm3 = 250/1000 = 0.25dm3
therefore c = 0.25 x 0.1 = 0.025moldm3