Download CONSERVATION OF MASS word problem practice

LAW OF CONSERVATION OF MASS
1)
LAW OF CONSERVATION OF MASS
Use the LAW OF CONSERVATION OF MASS to fill out the missing information in the table below. Use the
example #1 as a guide.
Mass of Reactants = Mass of Products
Reaction
Reactant(s)
1)
2)
Product(s)
H2
O2
H2O
3.4g
10g
13.4g
CH4
O2
12.2g
14g
3)
HgO
CO2
5)
6)
Li
Reaction
Reactant(s)
1)
H2O
Hg
2)
O2
O2
Li2O
5.7g
24.6g
C3H6
O2
11.1g
CO2
O2
H2O
3.4g
10g
13.4g
CH4
O2
12.2g
14g
3)
H2O
5)
15.6g
Al2O3
H2O
9.7g
2) Answer the word problems below using the LAW OF CONSERVATION OF MASS. SHOW ALL WORK AND
INCLUDE UNITS !!!!
CO2
H2O
20.0g
HgO
Hg
O2
23.6g
4)
21.8g
Product(s)
H2
13.0g
18.9g
Al(OH)3
Use the LAW OF CONSERVATION OF MASS to fill out the missing information in the table below. Use the
example #1 as a guide.
Mass of Reactants = Mass of Products
20.0g
23.6g
4)
1)
6)
Li
13.0g
O2
Li2O
5.7g
24.6g
C3H6
O2
18.9g
11.1g
Al(OH)3
CO2
H2O
15.6g
Al2O3
H2O
21.8g
9.7g
2) Answer the word problems below using the LAW OF CONSERVATION OF MASS. SHOW ALL WORK AND
INCLUDE UNITS !!!!
a)
Hydrogen and oxygen react chemically to form water. How much water would form if 14.8 grams of
hydrogen reacted with 34.8 grams of oxygen? (H2 + O2  H2O)
a)
Hydrogen and oxygen react chemically to form water. How much water would form if 14.8 grams of
hydrogen reacted with 34.8 grams of oxygen? (H2 + O2  H2O)
b)
When ammonium nitrate (NH4NO3) explodes, the products are nitrogen, oxygen, and water. When 40
grams of ammonium nitrate explode, 14 grams of nitrogen and 8 grams of oxygen form. How many grams
of water form? (NH4NO3  N2 + O2 + H2O)
b)
When ammonium nitrate (NH4NO3) explodes, the products are nitrogen, oxygen, and water. When 40
grams of ammonium nitrate explode, 14 grams of nitrogen and 8 grams of oxygen form. How many grams
of water form? (NH4NO3  N2 + O2 + H2O)
3)
What is the difference between an open system and a closed system?
3)
What is the difference between an open system and a closed system?
4)
A solid mass of 25g is mixed with 60g of a solution. A chemical reaction takes place and a gas is produced. The
final mass of the mixture is 75g. What is the mass of the gas released?
4)
A solid mass of 25g is mixed with 60g of a solution. A chemical reaction takes place and a gas is produced. The
final mass of the mixture is 75g. What is the mass of the gas released?
5)
If 100g of a substance reacts with 70g of another substance, what will be the mass of the products after the
reaction?
5)
If 100g of a substance reacts with 70g of another substance, what will be the mass of the products after the
reaction?
6)
A student adds 15g of baking soda to 10g of acetic acid in a beaker. A chemical reaction occurs and a gas is
given off. After the reaction, the mass of the products remaining in the beaker is 23g. Has mass been conserved
in this reaction? Explain.
6)
A student adds 15g of baking soda to 10g of acetic acid in a beaker. A chemical reaction occurs and a gas is
given off. After the reaction, the mass of the products remaining in the beaker is 23g. Has mass been conserved
in this reaction? Explain.