Question

What mass of O is found in 61.7 g of Al2(SO4)3?

Okay, so I did this, but for some reason I still got it wrong. :\

Answer 1

@Vocaloid

Answer 2

61.7g to moles Al2(SO4)3, times the molar mass of oxygen, times 12?

Answer 3

61.7 g x 1 mol / 342.17 g = 0.18032 mol Al2(SO4)3
0.18032 mol Al2(SO4)3 x 16 g/1 mol = 2.88 g

Answer 4

why times 12?

Answer 5

1 mole of Al2(SO4)3 has 12 moles of oxygen atoms per the formula

Answer 6

Ohhh, shoot I missed that. So 2.885 x 12 = 34.62 g

Answer 7

Thank you so much!