Thermochemistry Calculations

The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams?

• 12.82 °C
• 24.12°C
• 351 °C

Tags

NGSS.HS-PS3-1

Refer the the following question:
2N₂ + 3H₂ --> 2NH₃ + 46 kJ
How much energy would be produced if only 1 mol of nitrogen was reacted?

• 92 kJ
• 0.143 kJ
• 23 kJ
• 15 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

How much energy must be used to produce 4.75 mol of gaseous water?

H₂O (l) + 44.0 kJ --> H₂O (g)

• 209 kJ

• 9.36 kJ

• 206.8 kJ

• 9.362 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What mass of P₄ must be reacted to produce 5905 kJ of energy?
P₄ + 6Cl₂ --> 4PCl₃ + 2439 kJ

• 25.43 g
• 563.0 g
• 2.421 g
• 300.0 g

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

4 PCl₅ + 3438 kJ --> P₄ + 10 Cl₂
How much energy is required to produce each mole of chlorine?

• 687.6 kJ
• 859.5 kJ
• 343.8 kJ
• 245.8 kJ

Tags

NGSS.HS-PS3-1

The amount of heat energy required to change the temperature of 12 g of gold from 45°C to 15°C is -47 J. What is the specific heat capacity of gold?

• 0.13 J/(g°C)

• 17,000 J/(g°C)

• 1600 J/(g°C)

• 0.065 J/(g°C)

A cast iron skillet is used to fry bacon. For optimal frying, the pan must be heated to about 178 ^oC from a room temperature of 22.0 ^oC. It is known that 1.58 x 10⁵ J of heat energy are absorbed by the pan to reach the desired temperature and the specific heat of iron is 0.450 J/g ^oC. What must the mass of the skillet be?

• 12.7 kg

• 2.25 kg

• 110 kg

• 1.97 kg

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

How much heat does an aluminum block absorb if 10.00 grams ae heated from 25.0^oC to 50.0^oC? the specific heat of aluminum is .900J/g^oC

• 450
• -450
• 225
• -225

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

How much heat is needed to form 40.0 L of NO₂ from its elements at STP? 
N₂+ 2O₂ -> 2NO₂
ΔH = +67kJ

• 58.2 kJ
• 29.1
• 59.8
• 119.6

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

A 24.0 gram sample of copper was heated from 25.0^oC to 500.0^oC, 4378J of heat were absorbed, what is the specific heat of copper?

• .384
• 49909200
• 2.60
• 8.77

Tags

NGSS.HS-PS3-4