Question

Be sure to answer all parts.

Calculate the mass in grams of 16.8 mol of copper(I) carbonate. Enter your answer in scientific notation
with the correct number of significant figures.

Answer 1

Key Concepts

• Mass, moles, molar mass
• Stoichiometry

Solving the Question

`n=(m)/(M)`

• m = mass
• M = molar mass

Rearrange for m:

`m=nM`

Plug in given:

`m=(16.8)M`

⇒ The molar mass of copper (1) carbonate is 187.1 g/mol:

`m=(16.8)(187.1)\\m=3143.28`

Round to significant figures:

⇒ The given value has 3 significant figures:

`m= 3140`

Convert to scientific notation:

3.14 × 10³ g

Answer

3.14 × 10³ g