Kinetic Energy
A volleyball with a mass of 2.1 kg is served by a volleyball player. The ball leaves the player's hand at 30 m/s. What is the kinetic energy?
945 J
Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: 2 CO2(g) + H2O(g) → C2H2(g) + ⁵/₂ O2(g) C2H2(g) + 2H2(g) → C2H6(g) ΔH = –94.5 kJ H2O(g) → H2(g) + ½ O2 (g) ΔH =71.2 kJ C2H6(g) + ⁷/₂ O2(g) → 2 CO2(g) + 3 H2O(g) ΔH = –283 kJ
235 kJ
The specific heat of ethanol is 2.46 J/g C.What is the heat energy in J required to raise the temperature of the 193 g of ethanol form 19 C to 35 C?
7596 J
A sample of H₂ gas occupies a volume of 8.56 L at a temperature of 0°C and a pressure of 1.5 atm. How many moles of hydrogen are present?
0.57 mol
A mixture of 40.0 g of oxygen and 40.0 g of helium has a total pressure of 0.900 atm. What is the partial pressure of each gas?
He= 0.800 atm
O2=0.100 atm
What is the velocity of a 500 kg elevator that has 4000 J of energy?
4 m/s
Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values:
H2SO4(l) → SO3(g) + H2O(g) H2S(g) + 2 O2(g) → H2SO4(l) ΔH = –235.5 kJ H2S(g) + 2 O2(g) → SO3(g) + H2O(l) ΔH = –207 kJ H2O(l) → H2O(g) ΔH = 44 kJ
73 kJ
WHen a 120 g sample of aluminum absorbs 9612 J of heat energy, its temperature increases from 25 C to 115 C. What is the specific heat of aluminum?
0.89 J/g C
Calculate the volume of 0.845 mol of nitrogen gas at a pressure of 699.2 torr and a temperature of 315 K.
23.8 L
Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same 10.0 L container. At 23.0 °C, the total pressure in the container was measured to be 4.43 atm. Calculate the partial pressure of each gas in the container.
Methane- 1.23 atm
Ethane- 1.48 atm
Propane- 1.72 atm
What is the mass of an object tha creates 33,750 J of energyby traveling at 30 m/s?
75 kg
Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: N2(g) + 2 O2(g) → 2 NO 2(g) N2(g) + 3H2(g) → 2 NH3(g) ΔH = –115 kJ 2 NH3(g) + 4 H2O(l) → 2 NO2(g) + 7 H2(g) ΔH = –142.5 kJ H2O(l) → H2(g) + ½ O 2(g) ΔH = –43.7 kJ
-83 kJ
A 25 g sample of iron (initially at 800 C) is dropped into 200 g of water (initially at 30 C). THe final temperature of the system is 40.22 C. What is the specific heat of iron?
0.45 J/g C
A sample of methane gas with a volume of 38 mL at 5°C is heated to 86°C at constant pressure. Calculate its new volume.
49 mL
A gaseous mixture of O2 and N2 contains 32.8% nitrogen by mass. What is the partial pressure of oxygen in the mixture, if the total pressure is 785.0 mmHg?
614.0 mmHg
A platform diver with a mass of 50 kg has a kinetic enrgy of 15,000 J just prior to hitting the bucket of water. What is their velocity?
24.5 m/s
Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: CO2(g) → C(s) + O2(g) H2O(l) → H2(g) + ½ O2(g) ΔH = 643 kJ C2H6(g) → 2 C(s) + 3 H 2(g) ΔH = 190.6 kJ 2 CO2(g) + 3 H2O(l) → C2H6(g) + ⁷/₂ O2(g) ΔH = 3511.1 kJ
886 kJ
240 g of water at 20 C are mixed with a sample of iron at 500 C. The final temperature of the system is 42 C. What is the mass of the iron sample? (c of iron= 0.499)
107 g
A gaseous sample contains 0.35 moles of Argon at a temperature of 13°C and a pressure of 568 torr. If it’s heated to 56°C and a pressure of 897 torr, calculate the change in volume that occurs.
-3 L
A diver breathes a helium-oxygen mixture with an oxygen mole fraction of 0.050. What must the total pressure be for the partial pressure of oxygen to be 0.21 atm?
4.2 atm
What is the kinetic energy of a truck that has a mass of 2900 kg and is moving at 55 m/s?
4,386,250 J
Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: N2H4(l) + CH4O(l) → CH2O(g) + N2(g) + 3H2 (g) 2 NH3(g) → N2H4(l) + H2(g) ΔH = 22.5 kJ 2 NH3(g) → N2(g) + 3 H 2(g) ΔH = 57.5 kJ CH2O(g) + H2(g) → CH 4O(l) ΔH = 81.2 kJ
-46.2
A 150 g sample of water (initially at 45 C) is mixed with a 200 g sample of water (initially at 84 C). What is the final temperature of the system?
67.3 C
Diborane gas (B₂H₆) has a pressure of 345 torr at a temperature of -15°C and a volume of 3.48 L. If conditions change such that the temperature is 36°C and the pressure is 468 torr, what will be the volume of the sample
3.07 L
A sample of 1.43 g of helium and an unweighed quantity of O2 are mixed in a flask at room temperature. The partial pressure of helium in the flask is 42.5 torr, and the partial pressure of oxygen is 158 torr. What mass of O2 is in the sample?
42.5 g