Answer:

Explanation:
Hello there!
In this case, according to the given chemical reaction, it is possible for us to relate the rate of formation of C and the rate of consumption of B as shown below:

Thus, we solve for the rate of change of B as shown below:

Best regards!
Answer:
Eurkaryote... sorry if i wrong
Explanation:
O₂ required = 1/2 x 7.8 = 3.9 moles
The number of atoms of fluorine that are present in the molecules of CF4 is calculated as follows
1 x4 = 4 atoms of fluorine
in CF4 they are four atoms of fluorine since the subscribe 4 indicate that they are four atoms of fluorine