Units
What are the typical units for pressure?
atm
How many moles are in 4.5 grams of NaCl?
0.077 mole
As temperature goes up, with everything held constant, what happens to pressure?
Increases
What is the balanced chemical reaction for Sodium Chloride being formed from Sodium and Chlorine gas?
2Na + Cl2 --> 2NaCl
What are the typical units for Molarity?
M or mol/L
If 10.0 g of AgNO3 is available, find the volume needed to prepare a 0.25 M AgNO3 solution.
0.235 L
How would you describe the relationship between Pressure and Volume?
Indirect
Consider the following reaction:
P4(s) + 6 H2 (g) ––> 4 PH3 (g)
What mass of P4 will completely react with 2.50 L of hydrogen gas, at 0 ̊ C and 1.50 atm pressure?
3.46 g
What are the typical units for Temperature in PV=nRT?
K
You want to prepare 250 mL of 0.35 M NaCl solution. How many moles of salt will you need?
0.0875 mol
At STP, what is the volume of one mole of CO2 gas?
22.4 L
Consider the following reaction:
Zn + Cl2 --> ZnCl2
What volume of chlorine gas at 25 ̊ C and 1.00 atm is required to react completely with 1.13 g of zinc?
0.423 L
What are the typical units for density?
g/mL or g/cm3
You find experimentally that 15.0 kJ of energy is released when 0.002 moles of paraffin wax burns. How much energy would be released if 1 mole of paraffin wax burned?
7,500 kJ / mole
Oxygen makes up 20% of the atmosphere. If the pressure of the atmosphere is 0.98 atm, what is the partial pressure of the oxygen?
0.196 atm
When potassium chlorate, KClO3 is decomposed, oxygen gas and potassium chloride are produced. What volume of oxygen gas at STP is produced when 4.72 g of KClO3 decomposes?
1.3 L
What are the units for the R value of 0.0821?
L atm/mol K
What volume does 16.0 g of O2 occupy at STP?
11.2 L
If you collected 45 mL of H2 gas at about 25 ⁰C and 0.97 atm, what would the volume of hydrogen gas be if changed to STP?
The volume at STP would be less than 45 mL
Consider the following reaction:
Pb(NO3)2 + 2 NaOH --> Pb(OH)2 + 2 NaNO3
How many moles of lead (II) hydroxide can be formed when 0.0225 L of 0.135 M Pb(NO3)2 solution reacts with excess sodium hydroxide?
0.00304 mol