Question

A UP polytechnic container contains copper powder of mass 15.64 g. If the sum of the order of mass is 0.63 grams, the number is:

A. 15
B. 30
C. 60
D. 90

Answer 1

To find the number of copper atoms in the given mass, divide the mass by the molar mass of copper, then multiply by Avogadro's number. The answer is approximately 1.48 × 10^23 atoms, which corresponds to option C. 60.

Step-by-step explanation:

To find the number of copper atoms in the given mass, we need to use the concept of molar mass and Avogadro's number.

The molar mass of copper is 63.55 g/mol.

First, we convert the given mass (15.64g) to moles by dividing it by the molar mass of copper:

15.64g / 63.55 g/mol = 0.246 moles

Next, we can use Avogadro's number (6.022 × 10^23) to convert moles to atoms:

0.246 moles × 6.022 × 10^23 atoms/mole = 1.48 × 10^23 atoms

Therefore, the number of copper atoms in the given mass is approximately 1.48 × 10^23 atoms, which is option C. 60.