Question

why did they multiply by 3 why not 2 how do we know what nunber to multiply by

Combustion of a hydrocarbon: CH,+ 02 → CO2 + H20 X V 1.59 g 5.11 g 1.74 g Atom Grams 1.395 g C 0.195 g H Moles 1.395/(12.011) = 0.116 0.116/0.116 = 1 x3 0.195/(1.008) = 0.195 0.195/0.1169 = 1.67 x 3 EF mole Ratio C₂H,

Answer 1

We have

10.195 01169 = 1.67

But we know that

1.67 =

Thus, for each mole of C, we have $\frac{5}{3}$ moles of H.

The denominator in $\frac{5}{3}$ is 3. To make $\frac{5}{3}$ a whole number, we need to multiply it with denominator (3).