Question

I NEED HELP ASAP !

1. How many molecules are in 643.21 grams of
Mg3(PO4)22
2. How much space (Liters) does 4.061 x 10-24
molecules of H202 take up?
3. How many H20 atoms are in 479.3 grams of
H20 gas?
4. How many grams does 80.34 L of Ca(NO3)2
weigh?
5. How many Liters of space does 893.7 grams
of CO2 take up?
6. How many grams are in 5139 x10425
molecules of Al(OH)3

Answer 1

1.

643.21g 1 mol 6.022^23

262.87 g 1 mol

= 1.4735E24 [Mg3(PO4)2]

2.

4.061x10^24 1mol 22.4 (L)

6.022^23 1mol

= 151 liters H2O2

3.

479.3g 1 mol 6.022^23

18.02g 1mol

= 1.60E25 H20 atoms

4.

80.34L 1mol 164.1

22.4L 1mol

588.6g Ca(NO3)2

5.

893.7g 1mol 22.4

44.01g 1mol

= 427 L CO2 or 427.4

6.

5.39 x 10^25 1mol 78.01

6.022^23 1mol

= 6980g Al(OH)3

hope this helps!! :)