Question

given the equation: CH4 + 2O2 > CO2 + 2H2O How how many grams of CH4 I needed to react with 3.2 grams of O2?

Answer 1

Molar mass of CH$_4=16g/mol$

Molar mass of Oxygen$=32g/m$

Moles of O$_2=\frac{3.2}{32}=0.1$ moles

Moles of CH$_4=\frac{1}{2}×0.1=0.05$ moles

Grams of CH$_4=0.05×16$

$=0.8g$