How many grams of carbon dioxide are produced when 16.0 g of methane and 48.0 g of oxygen gas combust?
Molar mass of CH4 = 16.0 g/mol
Molar mass of O2 = 32.0 g/mol
Molar mass of CO2 = 44.0 g/mol

Mass of CO₂ = 33 g

Complete combustion of Hydrocarbons with Oxygen will be obtained by CO₂ and H₂O compounds.  

If O₂ is insufficient there will be incomplete combustion produced by CO and H and O  

Reaction

CH₄ + 2O₂⇒CO₂ + 2H₂O

mol CH₄ :

mol O₂ :

A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients

Because O₂ ratio smaller then O₂ becomes the limiting  reactants

So mol CO₂ from limiting reactants

mol CO₂ :

mass CO₂ :

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).