Calorimetry Problems

1.40 L of water was heated from 15.8^oC to 85.0^oC by burning 10.0 g of parafin (C₂₅H₅₂). What is the molar enthalpy of combustion of parafin?

• 14.3 kJ/mol

• 14.3 J/mol

• 2.09 kJ/mol

• 11.5 kJ/mol

Tags

NGSS.HS-PS1-4

Symbol for specific heat capacity

• q

• m

• c

• ΔH

How is she going to get the c (specific heat) by itself?

Tags

NGSS.HS-PS3-1

What is your final answer?

• 0.89 J/g°\degree°C

• 1.12 J/g°\degree°​C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

We will use lowercase "c" instead of C_S, what does c stand for?

• Temperature in Celcius

• specific heat capacity

• heat released or absorbed

Tags

NGSS.HS-PS1-5

The negative sign means that energy is released.  Does this mean that it's endothermic or exothermic?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?

• -80,256 J

• 80.256 J

• 80,256 J

• -80.256 J

Tags

NGSS.HS-PS3-4

Specific heat capacity is

• heat energy needed to raise temp by 1C

• heat energy needed to raise temp of 1g of substance by 1C

• heat energy absorb to raise 1g of substance to higher temp

• heat energy need to raise temp for 1g of substance

Tags

NGSS.HS-PS3-4

A metal cube at temperature of 70°C is immersed in water at temperature of 20°C. The metal _______ heat while the water __________ heat.

• gains, loses

• loses, gains

Tags

NGSS.HS-PS3-4

A metal cube with a mass of 55grams at temperature of 85°C is immersed in 150grams of water at temperature of 20°C. The metal and water then reach a final temperature of 23^oC. What is the specific heat of the metal?

• 0.55 J/g^oC

• 2120 J/g^oC

• 11.4 J/g^oC

• 4.18 J/g^oC

• 0.75 J/g^oC

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

NGSS.HS-PS3-4