Calculations Using On Balenced Equations (write On Paper If Needed) Flashcards
(3 cards)
Silicon carbide, SiC, which is used as an abrasive on sandpaper, is prepared using the chemical reaction.
3C+SiO2 ~~> 2CO+SiC
How many grams of SiC can be produced from 15.0 g of C?
(Write on paper if needed)
Ratio: 3:1
3= 3C
1= Sic
3C+SiO2 ~~> 2CO+SiC
M=15g M=1.25 ÷ 3= 0.42g (divide by ratio)
N=15÷12=1.25 N= 15.12g
GFM= GFM=
C 1x12 Si 1x24
12 24
=12 C 1x12
12
=36x0.42= 15.12g
The chemical equation for the photosynthesis reaction in plants is:
6H2O+6CO2 ~~> C6H12O6+6O2
How many grams of H,O reacts with 20.0 g of CO,?
(Write on paper if needed)
Ratio: 6:6 1:1
1= 6H2O
1= 6CO2
6H2O+6CO2 ~~> C6H12O6+6O2
M= 18x0.45 M= 20g
=8.1g
N= 0.45 N= 20/44= 0.45
GFM= GFM=
H 2x1 C 1x12
2 12
O 1x16 O 2x16
16 32
=18x0.45=8.1 =44
Decomposition of KCIO, serves as a convenient laboratory source of small amounts of oxygen gas. The reaction is:
2kClO ~~> 2kCl+3O2
What mass of KCIO, must be heated to produce 8 g of O,?
(Write on paper if needed)
Ratio: 2:3
2= 2KClO3
3= 3O2
2kClO ~~> 2kCl+3O2
M= 19.6g M= 8g
N= 0.25= 3= N= 8÷32=0.25
0.08x2= 0.16
GFM= GFM=
K 1x39 O 2x16
39 32
Cl 1x35.5 =8÷32= 0.25
35.5
O 3x16
48
=122.5x0.16