Question

A scientist has a 98,3 g sample of silicon, How many silicon atoms are in the sample?

Answer 1

The number of silicon atoms that are in this sample is: B. $2.11 \times 10^{23} \;atoms$

Given the following data:

• Mass of silicon = 98.3 grams

Scientific data:

• Avogadro's number = $6.02 \times 10^{23}$

• Molar mass of silicon = 28.09 g/mol.

To determine the number of silicon atoms that are in this sample:

First of all, we would determine the number of moles contained in 98.3 grams of silicon.

$Number\;of\;moles = \frac{mass}{molar\;mass}\\\\Number\;of\;moles = \frac{98.3}{28.09}$

Number of moles = 3.4995 moles

By stoichiometry:

1 mole of silicon = $6.02 \times 10^{23}$ atoms

3.4995 moles of silicon = X atoms

Cross-multiplying, we have:

$X = 6.02 \times 10^{23} \times 3.4995\\\\X= 2.11 \times 10^{23} \;atoms$

Read more on atoms here: brainly.com/question/10614569