Question

How many carbon atoms are present in a 10.0g sample of C3H8

Answer 1

Answer:

4.09ₓ10²³ atoms are contained in 10g of C₃H₈

Explanation:

1 mol of C₃H₈ has 3 mol of carbon and 8 mol of hydrogen.

1 mol of C₃H₈ weighs 44 g

In 44 g of C₃H₈ we have 3 mol of C

In 10 g of C₃H₈ we'll have (10 . 3)/ 44 = 0.681 mol

1 mol of C has NA (6.02x10²³) particles

0.681 mol will have (0.681 . 6.02x10²³) = 4.09ₓ10²³ atoms

Answer 2

Answer:

There are  4.1 *10^23 carbon atoms in 10.0 grams of C3H8

Explanation:

Step 1: Data given

Mass of C3H8

Molar mass of C3H8 = 44.1 g/mol

Number of Avogadro = 6.022 *10^23 / mol

Step 2: Calculate number of moles

Number of moles = mass / molar mass

Number of moles C3H8 = 10.0 grams / 44.1 g/mol

Number of moles C3H8 = 0.227 moles

Step 3: Calculate number moles of carbon

For 1 mol C3H8 we have 3 moles of carbon

For 0.227 moles of C3H8 we have 3*0.227 = 0.681 moles

Step 4: Calculate number of carbon atoms

Number of carbon atoms = 0.681 moles * 6.022 *10^23

Number of carbon atoms = 4.1 * 10^23 carbon atoms

There are  4.1 *10^23 carbon atoms in 10.0 grams of C3H8