HW6: Answer key
***Note that there are several problems included below that weren’t assigned. ***
Chapter 6
52a. 3.36x10-2 g H2O2
Chapter 7
52.
58. C3H8 + 5 O2  3 CO2 + 4 H2O
60. 2 NH3 + CO2  CO(NH2)2 + H2O
Chapter 8:
In 24a, below, the starting quantity should be 0.044 mol, and the answer is 0.088 mol.
A.
" 0.001 g %" 1 mole CO 2 %" 6.022x10 23 molecules CO 2 %" 2 atoms O %
21
180 mg CO 2 $
'$
'$
' = 4.926x10 atoms O
'$
1 mole CO 2
# 1 mg &# 44.01 g CO 2 &#
&#1 molecule CO 2 &
B.
!
!
%"147.94 g Na 3PO 4 %
"1 formula unit Na 3PO 4 %"
1 mole Na 3PO 4
2
9.8x10 24 Na + cations$
'$
'$
' = 8.0x10 gNa 3PO 4
+
23
#
&# 6.022x10 formula units Na 3PO 4 &# 1 mole Na 3PO 4 &
3 Na cations