Umm I think it might be a b c in order?
Answer:

Explanation:
Hello,
In this case, by using the ideal gas equation, er can compute the volume of fluorine gas as shown below:

Best regards.
There are 2 significant figures. All numbers in a whole number are significant.
Balanced equation:
Ca(OH)2+H2SO4=CaSO4+2 H20<span />