Question

Jaxson needs to react 16.3 moles of copper (II) nitrate, Cu(NO3)2, in a chemical reaction. How many grams of crystals

does he need to weigh out?

Answer 1

3056.25g

Step-by-step explanation:

Problem here is to find the mass of Cu(NO₃)₂ to weigh out to make for the number of moles.

Given;

Number of moles = 16.3moles

Unknown:

Mass of Cu(NO₃)₂ = ?

Solution:

To find the mass of Cu(NO₃)₂, use the expression below;

Mass of Cu(NO₃)₂ = number of moles x molar mass

Let's find the molar mass;

Cu(NO₃)₂ = 63.5 + 2[14 + 3(16)]

= 63.5 + 2(62)

= 187.5g/mol

Mass of Cu(NO₃)₂ = 16.3 x 187.5 = 3056.25g