Question

How many moles are in 95 grams of MgCO3

Answer 1

There are 1.1 moles of MgCO3 in 95g.

Answer 2

1.1 moles

Step-by-step explanation:

Stoichiometry allows us to convert units such as grams to moles.

Molar Mass

Before we can convert grams to moles, we need to understand molar mass. Molar mass is the number of grams per mole. For example, the molar mass of oxygen is 16 g/mol. This means that there are 16 grams in one mole. Inversely, there is one mole in 16 grams of oxygen. Molar mass is a constant for each element that can be found on a periodic table.

Now, for this conversion, we need to find the molar mass of MgCO₃. To do this, we need to find the molar mass of each element within the compound.

• Mg = 24.3
• C = 12
• O = 16

Now, multiply each molar mass by its subscript; then add the molar masses together.

• 24.3 + 12 + 3(16) = 84.3 grams

The molar mass of MgCO₃ is 84.3 grams.

Converting to Moles

Now we need to use stoichiometry to convert grams to moles. So, we are going to divide the grams by the molar mass.

• 
  `95g*(1mol)/(84.3g) =1.127 mol`

So, there are approximately 1.127 moles in 95 grams. However, due to significant figures, we round this to 1.1 moles.