Chem Lab Practical
320
400.0 mL of a gas are under a pressure of 800.0 torr. What would the volume of the gas be at a pressure of 1000.0 torr?
490.13
500.0 mL of a gas is collected at 745.0 mm Hg. What will the volume be at standard pressure ?
2400
600.0 mL of a gas is at a pressure of 8.00 atm. What is the volume of the gas at 2.00 atm?
0.63 M
If I leave 750 mL of 0.50M sodium chloride solution uncovered on a windowsill and 150 mL of the solvent evaporates, what will the new concentration of the sodium chloride solution be?
1.24 L
If a gas at 25C occupies 3.60 liters at a pressure of 1.00 atm, what will be its volume at a pressure of 2.50 atm?
107g
Magnesium fluoride is used in the ceramics and glass industry. What is the mass of 1.72 mol of magnesium fluoride?
105.2 g/cm
Select the answer that expresses the result of this calculation with the correct number of significant figures and with correct units. 16.18cm x 9.6114 g / 1.4783 cm^2 =
2.543 mol
Sodium hydroxide, also known as caustic soda, is used to neutralize acids and to treat cellulose in making cellophane. Calculate the number of moles of moles of solute in 1.875 L of 1.356 M NaOH solution
4.85 x 10^-2 g
Sulfur trioxide can react with atmospheric water vapor to form to form sulfuric acid that falls as acid rain. Calculate the mass in grams of 3.65 x 10^20 molecules of SO_3
2
The appropriate number of significant figures in the result of 15.234 - 15.208 is
41.26
What is the percent oxygen in Ca_3(PO_4)_2
10.7 g
What mass of carbon reacts completely with 17.8 grams of SiO_2 according to the following equation?
78.7g
What mass of oxygen is consumed by the complete combustion of 23.0 grams of ethylene?
0.400 L
What volume , in L, of 10.0 M HCl is needed to make 2.00 L of 2.00 M HCl solution by dilutions with water
73.3 mL
What volume of 0.300 M NaCl is required to precipitate all the Pb^2+ ion from 25.0 mL of aqueous 0.440 M Pb(NO_3)_2?
Volume will decrease
When the pressure on a gas increases, will the volume increases or decreases?
2.60
a gas occupies 4.32 liters at a pressure of 0.755 atm. Determine the volume if the pressure is increased to 1.25 atm.
1.818 L
How many liters of 0.1107 M KCl (aq) contain 15.00 g of KCl?
2.6 x 10^-2
How many moles are in 4.5 g of AgNO_3?
280 M
If I have 340 mL of a 0.5 M NaBr solution, what will the concentration be if I add 560mL more water to it?
16.1 g
A 0.150 M sodium chloride solution is referred to as a physiological saline solution because it has the same concentration of salts as normal human blood. Calculate the mass of solute needed to prepare 275.0 mL of a physiological saline solution.
0.520 L
A gas occupies 1.56L at 1.00 atm. What will be the volume of this gas if the pressure becomes 3.00 atm?
0.642 atm
A gas occupies 11.2 liters at 0.960 atm. What is the pressure if the volume becomes 15.0 L?
8.20 L
A gas occupies 12.3 L at a pressure of 40.0 mm Hg. What is the volume when the pressure is increased to 60.0 mm Hg?
precision
A student makes several measurments of the density of an unknown mineral sample. She then reports the average value of these measurement. The number of significant figures she uses in her result
230.94 g/mol
Calculate the molar mass of rubidium carbonate, Rb_2CO_3
283.89 g/mol
Calculate the molar mass of tetra phosphorus decocted, P_4O_10, a corrosive substance which can be used as a drying agent.
59.66
Convert 273.15 mL at 166.0 mm of Hgto its new volume at standard pressure
21294
Convert 338 L at 63.0 atm to its new volume at standard pressure.
340.78
Convert 350.0 mL at 740.0 mm of Hg to its new volume at standard pressure?
1.82
Convert 77.0 L at 18.0 mm of Hg to its new volume at standard pressure
9.6 x 10^4 m
Express 96,342 m using 2 significant figures.
233.79 g/mol
calculate the molar mass of Ca(BO_2)_2 X 6H_2O
false
the number 6.0448, rounded to 2decimal places, becomes 6.05. (T or F)
133 atm
to what pressure must a gas be compressed in order to get into a 3.0 cubic foot tank the entire weight of a gas that occupies 400.o cubic feet at standard pressure?
