Answer:The correct answer is option C.
Explanation:

At STP, 1 mol of gas occupies 22.4 L of volume
So, 100.0 L volume of
will be occupied by :

According to reaction 2 moles
are obtained from 1 mole of
.
Then,4.4642 moles of
will be obtained from :
that is 2.2321 moles of 
Mass of
gas:
Moles of
gas Molar mass of
gas:

Hence, the correct answer is option C.
If the equation is not balanced, you have extra of one substance. If you try to do an experiment, you could wind up with a totally different outcome. Its kind of like baking a cake. If the ingredients aren't the right amounts, you dont get an edible cake.
it will take john 3 hours to reach his destination
1 hour = 52 miles x 3 = 156 miles
Should be B, because one rotation is a day one revolution is a day(also to check I looked up the difference).
Neon is an element because it is a pure atom