Question

adding compounds worksheet 2
2c₂h₅oh

1. carbon = 4
2. hydrogen = 12
3. oxygen = 2

2al + 3o₂

1. aluminum = 2
2. oxygen = 6

h₂so₄ + 2hi

1. hydrogen =
2. sulfur =
3. oxygen =
4. iodine =

k₂o + h₂o

1. potassium =
2. oxygen =
3. hydrogen =

co₂ + 2h₂o

1. carbon =
2. oxygen =
3. hydrogen =

c₆h₁₂o₆ + 3o₂

1. carbon =
2. oxygen =
3. hydrogen =

si₂h₃ + 2h₂o

1. silicon =
2. hydrogen =
3. oxygen =

2naoh + 4h₂ + o₃

1. sodium =
2. hydrogen =
3. oxygen =

3na₃po₄ + mgcl₂ + o₂

1. sodium =
2. phosphorus =
3. oxygen =
4. magnesium =
5. chlorine =

Explanation:

Step1: Count atoms in $H_2SO_4 + 2HI$

For hydrogen, in $H_2SO_4$ there are 2 H - atoms and in 2HI there are 2 H - atoms, so total H = 4; sulfur in $H_2SO_4$ is 1; oxygen in $H_2SO_4$ is 4; iodine in 2HI is 2.

1. Hydrogen = 4
2. Sulfur = 1
3. Oxygen = 4
4. Iodine = 2

Step2: Count atoms in $K_2O + H_2O$

Potassium in $K_2O$ is 2; oxygen in $K_2O$ and $H_2O$ combined is 2; hydrogen in $H_2O$ is 2.

1. Potassium = 2
2. Oxygen = 2
3. Hydrogen = 2

Step3: Count atoms in $CO_2+2H_2O$

Carbon in $CO_2$ is 1; oxygen in $CO_2$ and 2$H_2O$ combined is 4; hydrogen in 2$H_2O$ is 4.

1. Carbon = 1
2. Oxygen = 4
3. Hydrogen = 4

Step4: Count atoms in $C_6H_{12}O_6 + 3O_2$

Carbon in $C_6H_{12}O_6$ is 6; oxygen in $C_6H_{12}O_6$ and 3$O_2$ combined is 12; hydrogen in $C_6H_{12}O_6$ is 12.

1. Carbon = 6
2. Oxygen = 12
3. Hydrogen = 12

Step5: Count atoms in $Si_2H_3+2H_2O$

Silicon in $Si_2H_3$ is 2; hydrogen in $Si_2H_3$ and 2$H_2O$ combined is 7; oxygen in 2$H_2O$ is 2.

1. Silicon = 2
2. Hydrogen = 7
3. Oxygen = 2

Step6: Count atoms in $2NaOH + 4H_2+O_3$

Sodium in 2$NaOH$ is 2; hydrogen in 2$NaOH$ and 4$H_2$ combined is 10; oxygen in 2$NaOH$ and $O_3$ combined is 5.

1. Sodium = 2
2. Hydrogen = 10
3. Oxygen = 5

Step7: Count atoms in $3Na_3PO_4+MgCl_2+O_2$

Sodium in 3$Na_3PO_4$ is 9; phosphorus in 3$Na_3PO_4$ is 3; oxygen in 3$Na_3PO_4$ and $O_2$ combined is 14; magnesium in $MgCl_2$ is 1; chlorine in $MgCl_2$ is 2.

1. Sodium = 9
2. Phosphorus = 3
3. Oxygen = 14
4. Magnesium = 1
5. Chlorine = 2

Answer:

1. 4
2. 1
3. 4
4. 2
5. 2
6. 2
7. 2
8. 1
9. 4
10. 4
11. 6
12. 12
13. 12
14. 2
15. 7
16. 2
17. 2
18. 10
19. 5
20. 9
21. 3
22. 14
23. 1
24. 2