Question

Calculate the number of moles of sucrose in 50.5 grams Sucrose X (1 mol sucrose/342.30 grams sucrose) =

Answer 1

Step 1 - Understanding molar mass

The molar mass of a substance is the mass, in grams, of one mole of that substance. Let's take water as an example.

The molar mass of water is 18 g/mole. This means that in 18 g of water there is one mole of water, which corresponds to 6.02*10^23 molecules of water.

The molar mass of sucrose is 342.3 g/mole, which means 1 mole of sucrose weights 342.3 g.

Step 2 - Calculating the number of moles of sucrose

We can use the molar mass to set the following proportion:

`\begin{gathered} 1\text{ mole of sucrose weights --- 342.3 g} \\ x\text{ ------------------- 50.5 g} \\ \\ x=(50.5)/(342.3)=0.15\text{ moles of sucrose} \end{gathered}`

There are thus 0.15 moles of sucrose in 50.5 g of it.