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.
Answer:
Sublimation is being represented.
Sublimation is the transition from solid to gas state
Hope this helps! Have a good day!
Answer:
Option B. 2Mg(s) + O2 (g) —> 2MgO (s)
Explanation:
From the question given above,
We were told that:
2 solid Mg atoms bond with O2 gas to produce solid MgO.
This can be represented by an equation as follow:
2Mg(s) + O2 (g) —> MgO (s)
Next, we shall balance the above equation as follow:
2Mg(s) + O2 (g) —> MgO (s)
There are 2 atoms of Mg on the left side and 1 atom on the right side. It can be balance by putting 2 in front of MgO as shown below:
2Mg(s) + O2 (g) —> 2MgO (s)
Now, the equation is balanced.
When it comes into contact with It will turn purple