How many grams of H2 gas are produced if 48
grams of CH4 gas are consumed?

Mass = 12.12 g

Explanation:

Given data:

Mass of CH₄ = 48 g

Mass of H₂ produced = ?

Solution:

Chemical equation:

CH₄ →   C + 2H₂

Number of moles of CH₄:

Number of moles = mass/molar mass

Number of moles = 48 g/ 16 g/mol

Number of moles = 3 mol

Now we will compare the moles of CH₄  and H₂.

               CH₄          :           H₂

                  1             :           2

                  3            :          2/1×3 = 6 mol

Mass of  H₂:

Mass = number of moles × molar mass

Mass = 6 mol × 2.02 g/mol

Mass = 12.12 g

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.