Identifying 1
The number of sigfigs in 556
3
This number has 4 sigfigs
6904 or 6940
6904
Create a number between 1 and 100 that has 3 sigfigs
Ex: 1.01 or 99.9
A 15g sample of Fe was collected and the density was calculated to be 7.874 g/cm³. Round this density to the correct sigfigs
7.9 g/cm³
2 mol of He is how many grams of He?
(Molar mass of He is 4.00 g/mol)
8 g He
The number of sigfigs in 6007
4
This number has 3 sigfigs
1.02 or 0.022
1.02
Create a number between -1 and 1 that has 2 sigfigs
Ex: 0.50 or 0.12
62 g of phosphorus is calculated to be 2.0019 mol of phosphorus. This is correctly rounded to
2.0 mol
80 g of Ar is how many mol of Ar?
(Molar mass of Ar is 39.95 g/mol)
2 mol Ar
The number of sigfigs in 30100
3
The number has 5 sigfigs
1455.0 or 0.00012
1455.0
Create a number between -5 and 10 that is 3 sigfigs
Ex: 2.55
2.1 mol of Selenium is calculated to be 165.8 g of Selenium. This is correctly rounded to
170 g
5.5 g of Na is how many mol Na?
(Molar mass of Na is 22.99 g/mol)
0.24 mol Na
The number of sigfigs in 0.000008
1
This number has 1 sigfig
5000 or 1.0
5000
Create a number between 10,000 and 11,000 that is 4 sigfigs
Ex: 10,540
4.0 g Ca is calculated to be 0.0998 mol Ca. This is correctly rounded to
0.10 mol Ca
5 mol of CO2 is how many grams of CO2?
(Molar mass of C = 12.01 and O = 16.00)
200 g CO2
The number of sigfigs in 0.0002250
4
This number has 2 sigfigs
0.01 or 0.10
0.10
Create a number between 0.001 and 0.1 that is 5 sigfigs
Ex: 0.012345
A 8.10 mol sample of oxygen is calculated to have a mass of 129.6 g. This is correctly rounded to
130. g
0.36 g of H2O is how many mol of H2O?
(Molar mass of H = 1.01 and O = 16.00)
0.020 mol H2O