Gas Laws
1.00 L of a gas at standard temperature and pressure is compressed to 473 mL. What is the new pressure of the gas
What is 2.11 atm
P1V1=P2V2
Directly proportionate
Given the following equation, what volume of CO2 measured at STP is produced if 15.2 grams of CaCO3 is heated?
CaCO3 --> CaO _ CO2
What is 3.40 L CO2
1. stoich
2. V=nRT/P
What is the relationship of temperature to Kinetic energy
The average kinetic energy is proportional to the temperature in kelvins.
Convert 636 into calories
152 calories
A gas absorbs 45 kJ of heat and does 29 kJ of work Calculate E
What is 16 kJ
+45 q
- 29 w
The temperature inside my refrigerator is about 4 0 Celsius. If I place a balloon in my fridge that initially has a temperature of 22 0 C and a volume of 0.5 liters, what will be the volume of the balloon when it is fully cooled by my refrigerator?
What is 0.47 L
T1/V2= T2/V2
(inversely related)
Determine the volume of O2 (at STP) formed when 50.0 g of KClO3 decomposes according to the following reaction. The molar mass for KClO3 is 122.55 g/mol.
2 KClO3(s) → 2 KCl(s) + 3 O2(g)
What is 13.7 L O2
1. n=pV/RT
2. stoich
Describe the difference in heat vs temperature.
Heat is the transfer of energy
Temperature is the measure
Convert 2534 kcal to J
1.06 x 10^7 J
When 3.54 g of C10H8 (molar mass is 128.18g/mol) burns in a bomb calorimeter, the temperature rises from 25.2 °C to 36.9 °C. Find ΔERXN in kJ/mol for the combustion of C10H8. The heat capacity of the calorimeter is 7.14 kJ/°C.
q cal= Ccal x ΔT
3030kj/mol
A gas mixture contains oxygen, nitrogen, and carbon dioxide. If the total pressure in the tank is 2457 mm Hg, and the partial pressure of nitrogen and carbon dioxide are 12.4 psi and 1.34 atm respectively, what is the partial pressure of oxygen in atm?
What is 1.05 atm
Calculate the density of nitrogen gas at 39.0 °C and 735.0 mmHg pressure?
What is 1.06 g/L
At STP, which sample has the greatest volume? Explain your reasoning.
10g He
10g Ne
10g N
All have the same Volume
What is 10 g He
Because volume and moles are directly proportional therefore the smallest molar mass forms the most moles which correlate to the highest volume
Enthalpy: Identify the following as endo or exothermic and what the ΔH sign would be (+/-)
a. sweat evaporating from skin
b. wood burning in a fire
c. water freezing in a freezer
a. endo +ΔH
b. exo -ΔH
c. exo -ΔH
Stoich involving delta H (slide 53)
Given the following equation:
C3H8(g) + 5 O2(g) -->3 CO2(g) + 4 H2O(g) ΔHRXN = -2044 kJ
Calculate the heat (in KJ) associated with the combustion of excess propane with 32.5 g of O2?
-415 kJ
What is the molar mass of a gas if 14.0g occupies 186 L at 3.80 x 102 torr and 127 °C?
What is 4.95 g/mol
m= drt /p
(0.0753 * 0.0821 * 400) / 0.5
What volume of oxygen at STP is produced when 0.0816 g of potassium chlorate decomposes to form potassium chloride and oxygen?
2KClO3→2KCl+3O2
What is 2.78 L O2
Describe the relationship of E system to E surroundings...
E system must equal E surrounds because energy cannot be created nor destroyed
*This of gas tank
What is specific heat capacity
the amount of heat energy required to raise the temperature of one gram of a substance 1*C
Calculate the amount of heat, in J, required to raise the temperature of 56.2 g sample of mercury from 26.4 °C to 49.5 °C. The specific heat capacity of mercury is
0.140 J/g∙°C
(slide 35)
182 J
A sample of argon gas at STP occupies 56.2 liters. Determine the mass in grams of argon in the sample.
What is 100g of Argon
PV=nRT
How many grams of KCl(s) are produced from the thermal decomposition of KClO3(s) which produces 50.0 mL of O2(g) at 25°C and 1.00 atm pressure according to the chemical equation shown below?
2 KClO3(s) → 2 KCl(s) + 3 O2(g)?
0.102 g of KCl
The reason why a hot air balloon goes up in the air is that...
the hot air inside the balloon is less dense
An 18.7 g sample of platinum metal increases in temperature by 2.30 °C when 5.70 J of heat is added. What is the
specific heat of platinum.
.132 J/g*C
Given the following information:
Cu + Cl2 -> CuCl2 ΔH° = −206 kJ
2 Cu + Cl2 -> 2 CuCl ΔH° = − 36 kJ
Calculate the ΔH ° for the reaction below:
Cu + CuCl2 -> 2 CuCl ΔH° = ? kJ
170 kJ
(slide 59)