Answer:
195
Explanation:
First, calculate the molar mass of CaF2:
Ca: 1 × 40.078 g/mol = 40.078 g/mol
F: 2 × 18.998 g/mol = 37.996 g/mol
40.078 g/mol + 37.996 g/mol = 78.074 g/mol CaF2
Then, convert moles to grams by multiplying the number of moles by the molar mass:
2.50 mol CaF2 × 78.074 g/mol CaF2 = 195 g CaF2
195.199grams
Fluorine has a molar mass of 18.99984 while calcium has a molar mass of calcium is 40.08.
1 mole of calcium fluoride has a mass of 40.08+2×18.99984
=78.0797 grams
if one mole has a mass of 78.0797 grams, then 2.5 moles have:
2.5 moles× 78.0797 grams/mole= 195.1992 grams
i believe the answer is a
2
Your question is not specific enough so, I've given you a list of things that occurs, when a reaction has taken place.
It could be in the form of:
Heat or light given off or a colour change.
Hope this helps!
