Answer:
479 grams
Step-by-step explanation:
5.43 times the molar mass of CaSO4 would give us the answer.
(5.43) * (40.078 + 32.066 + 15.9994) = 478.618662 grams
Significant figures is 3, meaning we need to round it into 3 places, giving us 479 grams.