Question

Convert 7.10 grams of sodium to atoms.

Answer 1

Answer: 1.86 x 10^23

Explanation: This comes straight from the process of mole conversions. The 1st step is to calculate how many moles of sodium you have, so you divide the grams of sodium by how many grams of sodium are in 1 mole—22.99 grams. 7.10g/22.99g = 0.3088 moles of sodium.

The next step is to multiply the moles of sodium to Avogadro’s number, which is approximately 6.02 x 10^23. So 0.3088 x 6.02 x 10^23 = 1.86 x 10^23 atoms.

Hope this helps:)

Answer 2

The answer is option A.

To convert 7.10 grams of sodium to atoms we first find the number of moles and use the formula

N = n × L

N = number of entities

n = number of moles

L = Avogadro's constant which is

6.02 × 10^23

number of moles (n) = mass / Molar mass (M)

Molar mass of sodium = 23g/mol

mass = 7.10g

n = 7.10/23 = 0.309 moles

So number of sodium atoms (N) is

N = 0.309 × 6.02 × 10^23

N = 1.86*10^23 atoms

Hope this helps you.