Problema Solution
If 247.5 ml of H2O2 were decomposed and every 5.000ml of H2O2 that decomposes produces 1.2 x 10-3 g of oxygen gas. How many microliters of oxygen gas were produced if the density of oxygen gas is .00143 g:cm cubed?
Answer provided by our tutors
5000 ml of H2O2 produces 1.2*10-3 g of oxygen gas
let 247.5 ml of H2O2 produce 'x' g of oxygen gas
we have the following ration
247.5/5000 = x/(1.2 x 10-3)
x = (247.5*1.2*10^(-3))/5000 g
density = mass / volume
volume = mass / density
density = 0.00143 g/cm^3
volume = ((247.5*1.2*10^(-3))/5000)*0.00143 cm^3
1 microliter = 0.001 cm^3
1 cm^3 = 10^3 microliters
volume = ((247.5*1.2*10^(-3))/5000)*0.00143*10^3 microliters
volume = 8.4942 *10^(-5) microliters
8.4942 *10^(-5) microliters of oxygen gas was produced.