Question

34 atoms of carbon (C) react with 22 molecules of hydrogen gas (H2). How many molecules of methane (CH4) will be formed, and what will be left over

Answer 1

Answer:

11 molecules of CH4.

23 atoms of C is the leftover.

Explanation:

Hello!

In this case, for the formation of methane:

$C+2H_2\rightarrow CH_4$

We can see there is an excess of carbon based on their stoichiometry, because the needed amount of hydrogen gas molecules would be:

$molecules _{H_2}=34atomC*\frac{2molec\ H_2}{1atomC} =68molec\ H_2$

Thus, the formed molecules of methane are computed below:

$molec\ CH_4=22molec\ H_2 *\frac{1molec\ CH_4}{2molmolec\ H_2} \\\\molec\ CH_4=11molec\ CH_4$

In such a way, the leftover of carbon atoms are:

$atoms \ C^{left over}=34-22molec\ H_2*\frac{1atoms C}{2molec\ H_2} \\\\atoms \ C^{left over}=23 atoms C$

Best regards!