Name: __________________________________________________ Date:____________________________ Block:____________
LAW OF DEFINITE PROPORTIONS Practice
Complete the Table:
Mass H2
2g
4g
Mass of F2
38 g
114 g
Mass of 2HF
40 g
80 g
120 g
160 g
10 g
304 g
20 g
Find the % of each element. (Use the equation %=(Portion/Total) x 100) (Show your work to get full credit)
11-14) In a sample of water H2O there are 1g of H (2g for H2) and 16g of O.
What is the percentage of H2 in Water?
What is the percentage of O in water?
15-18) In a sample of ammonia gas NH3, there are 14g of N and 1g of H (3g for H3).
What is the percentage of N in NH3 gas? What is the percentage of H3 in NH3 gas?
19-20) 22g of Sodium (Na) combine with 34g Chlorine (Cl) to produce 56g NaCl. Fill in the missing numbers.
54g Na
+
68g Cl
=
_________g NaCl
+
_________g Na
Due Tues Sept 30 at beginning of class for full credit – 1 day late minus 10% - 2 days or more late minus 50%
Name: __________________________________________________ Date:____________________________ Block:____________
LAW OF DEFINITE PROPORTIONS Practice
Complete the Table:
Mass H2
2g
4g
Mass of F2
38 g
114 g
Mass of 2HF
40 g
80 g
120 g
160 g
10 g
304 g
20 g
Find the % of each element. (Use the equation %=(Portion/Total) x 100) (Show your work to get full credit)
11-14) In a sample of water H2O there are 1g of H (2g for H2) and 16g of O.
What is the percentage of H2 in Water?
What is the percentage of O in water?
15-18) In a sample of ammonia gas NH3, there are 14g of N and 1g of H (3g for H3).
What is the percentage of N in NH3 gas? What is the percentage of H3 in NH3 gas?
19-20) 22g of Sodium (Na) combine with 34g Chlorine (Cl) to produce 56g NaCl. Fill in the missing numbers.
54g Na
+
68g Cl
=
_________g NaCl
+
_________g Na
Due Tues Sept 30 at beginning of class for full credit – 1 day late minus 10% - 2 days or more late minus 50%