# Question: Where are the numbers for a mole ratio found?

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## How do you find the molar ratio?

number of moles = mass/formula mass. The molar ratio from the balanced equation must be considered to tell us how many moles of aluminium will be released. To finish off the question, we must change one mole of aluminium into a mass. So, 55 g of aluminium oxide will produce 27 g of aluminium upon being electrolysed.

## How do you find a ratio in chemistry?

Write the number of moles of each element over the number of moles of the compound. For example, the ratio for the amount of nitrogen in two moles of nitrogen dioxide, 2NO2, is 1-to-2. The ratio for the amount of oxygen in two moles of nitrogen dioxide is 2-to-2. Compare the amount of the each element in the compound.

## How do you find the experimental molar ratio?

To get the experimental molar ratio, you divide the moles of each reactant that you actually used in the experiment by each other.

## How do you find molar ratio from mass?

Worked Example of Using Mole Ratio to Calculate Mass of Reactant or Product

1. mass O2 = moles(O2) × molar mass(O2) (a) Calculate moles(Mg) = mass(Mg) ÷ molar mass(Mg) moles(Mg) = 12.2 ÷ 24.31 = 0.50 mol. …
2. mass MgO = moles(MgO) × molar mass(MgO) (a) Calculate moles Mg. moles(Mg) = mass(Mg) ÷ molar mass(Mg)