Qwertype

The molar mass of Aluminum Fluoride is 83.98 grams/mol. How many grams are in 5.28 x 10^23 formula units of Aluminum fluoride? a. 0.73 grams b. 1.37 grams c. 73.6 grams d. 95.8 grams

2C2H6 + 7O2 ---> 4CO2 + 6H20 How many moles of O2 are needed to completely react with 4.50 moles of C2H6 according to the above equation? a. 5.8 moles b. 3.11 moles** c. 1.29 moles d. 63.0 moles I think it's be but aren't 100% sure. Thank you!