Density, Volume and Mass
A metal ball has the mass of 2 kg and a volume of 6 m3. What is it's density?
1/3 kg/m3
A scientist combines 48 grams of oxygen with 112 grams of iron. How many grams of iron(III) oxide does he make?
160 grams
Convert 19 inches to feet
What is 1.6 ft
How many sig figs are in the following numbers?
1. 12.59
2. 1200
3. 1.2090
4. 0.0398
1. 4
2. 2
3. 5
4. 3
Neon has 2 isotopes: Ne-20 and Ne-22 with masses of 20 u and 22 u respectively. Given that Ne-20 has an abundance of 90% and Ne-22 has an abundance of 10%, what is the average atomic mass of neon?
20 amu
Water has a density of 1 g/mL. What is the mass of the water if it fills a 10 mL container?
10 grams
Two reactants react to make two products in the reaction A + B --> C + D. If 10 grams of A and 15 grams of B were used, how much D was produced if 5 grams of C was made?
What is 20 grams
Convert 5.70 kilograms to milligrams
5.70 x 106 mg
Solve the following:
1. 0.005-0.0007
2. 7.895 + 3.4
1. 0.004
2. 11.3
What is the average atomic mass of silicon given the following abundance information:
Si-28 - 92.21%
Si-29 - 4.70 %
Si-30 - 3.09%
28 amu
What is the volume of a marble that has a mass of 3 g and density of 2.7 g/mL?
1.11 mL
A 78.0 gram sample of an unknown compound contains 12.4 grams of hydrogen. What is the percent by mass of hydrogen in the compound?
What is 16%
The density of an unknown rock is 19.3 g/mL. What would its density be if it were expressed in kg/L?
What is 19.3 kg/L
Solve the following:
1. 7.895 / 34
2. 4.35 x 2.74 x 3.008
1. 0.23 or 2.3 x 10-1
2. 35.9
Calculate the atomic mass of potassium if the abundance atomic masses of the isotopes making up its naturally occurring samples are given below:
potassium-39 93.12% 38.964 amu
potassium-41 6.88% 40.962 amu
39.1 amu
A solid is 5 cm tall, 3 cm wide and 2 cm thick. Its mass is measured to be 129 g. What is its density?
4.3 g/cm3
A 134.50 gram sample of aspirin is made up of 6.03 grams of hydrogen, 80.70 grams of carbon, and 47.77 grams of oxygen. What is the percent by mass of each element in aspirin?
H: 4.48%
C: 60%
O: 35.5%
Our room temperature is 69oF. What is the temperature in Celsius and Kelvin?
What is 21oC and 294 K
Round the following to 3 sig figs using scientific notation when appropriate:
1. 234,555,359
2. 0.090035
3. 14,090
1. 235,000,000 or 2.35 x 108
2. 0.0900 or 9.00 x 10-2
3. 14,100 or 1.41 x 104
Calculate the mass of Cr-50 given that the average atomic mass of Cr =
Cr-50 ? 4.3500%
Cr-52 51.941 83.800%
Cr-53 52.941 9.5000%
Cr-54 53.939 2.3500%
49.942 amu
A graduated cylinder is filled to an initial volume of 12.7 mL. A rock is dropped into the graduated cylinder. The final volume of the graduated cylinder is 18.2 mL. What is the rock's volume?
5.5 mL
What is the percentage by weight of each element in the chemical ammonium phosphate, (NH4)3PO4?
N: 28.2%
H: 8.1%
P: 20.8%
O: 43.0%
If lab requires each lab group to have 25 mL of a solution and it takes 15 grams of CuNO3 to make 1 liter of solution, how many grams are needed to make enough solution for 22 lab groups?
What is 8.3 grams
Solve:
(4.1 - 0.0093)(0.082 x 273)
92
Calculate the percentages of each isotope present in a mixture of
113In and 115In which has an average atomic mass of 114.8 u.
10% and 90%