What mass of CH will be made when 10.0 g of H reacts with 5.0 g of C?

Mass of CH  = 5.46 g

Explanation:

Given data:

Mass of H = 10.0 g

Mass of C = 5.0 g

Mass of CH = ?

Solution:

Chemical equation:

C + H     →   CH

Number of moles of H:

Number of moles = mass/molar mass

Number of moles = 10.0g / 1 g/mol

Number of moles =  10 mol

Number of moles of C:

Number of moles = mass/molar mass

Number of moles = 5.0g / 12 g/mol

Number of moles = 0.42 mol

Now we will compare the moles of H and C with CH.

                      C       :     CH

                        1        :       1

                      0.42    :     0.42

                       H        :        CH

                        1         :       1

                     10         :      10

Number of moles of CH produced by C are less it will act as limiting reactant.

Mass of CH:

Mass = number of moles × molar mass

Mass = 0.42 mol × 13 g/mol

Mass = 5.46 g