Question

You have 500 grams of Co2S3. How many moles are present?

Answer 1

Answer

2.34 moles

Explanation

Given:

The number of grams of Co2S3 = 500 grams

What to find:

The number of moles of Co2S3 present in 500 grams Co2S3.

Step-by-step solution:

From the Periodic table; the molar mass of (Co = 58.933 g/mol, S = 32.065 g/mol).

The molar mass of 1 mole of Co2S3 is calculated as follows:

$\begin{gathered} Co_2S_3=2Co+3S=2\times58.933\text{ g/mol }+3\times32.065\text{ g/mol} \\ =117.866\text{ }g\text{/}mol+96.195\text{ }g\text{/}mol \\ =214.061g\text{/}mol \end{gathered}$

If 1 mole of Co2S3 are present in 214.061 grams Co2S3

therefore, the number of moles present in 500 grams Co2S3 will be:

$\frac{1\text{ }mol\text{ }Co_2S_3\times500\text{ }grams\text{ }Co_2S_3}{214.061\text{ }grams\text{ }Co_2S_3}=2.34\text{ }mol\text{ }Co_2S_3$

The number of moles of Co2S3 present in 500 grams Co2S3 is 2.34 moles.