Calculate the amount of heat that must be released to convert 20.0 g of mercury vapor at #387^@"C"# to liquid mercury at #307^@"C"# (in kJ)?
However, we need to appreciate the underlying steps in the thermal transformation taking place. The change takes place in 3 steps:
By signing up, you agree to our Terms of Service and Privacy Policy
To calculate the heat released, use the formula: ( q = m \cdot C \cdot \Delta T ), where ( q ) is the heat, ( m ) is the mass, ( C ) is the specific heat, and ( \Delta T ) is the temperature change. For mercury, ( C ) is 0.140 J/g°C. First, find the heat to cool the vapor to 307°C, then the heat to condense it at that temperature.
[ q = (20.0 , \text{g}) \cdot (0.140 , \text{J/g°C}) \cdot (387°C - 307°C) + (20.0 , \text{g}) \cdot (295 , \text{J/g}) ]
[ q = 2800 , \text{J} + 5900 , \text{J} ]
[ q = 8700 , \text{J} = 8.7 , \text{kJ} ]
By signing up, you agree to our Terms of Service and Privacy Policy
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
- Calculate the change in enthalpy #( DeltaH)# for the chemical reaction modeled by this chemical equation: #H_2 + Cl_2 rarr 2HCl# Is energy entering or leaving the system? How do you know? What happens to the covalent bonds during this reaction?
- How much heat is absorbed when 52.3 g #H_2O#(l) at 100 C and 101.3 kPa is converted to steam at 100 C? The molar heat of vaporization of water is 40.7 kJ/mol.
- What is the difference between enthalpy and entropy?
- When a solid melts, is thermal energy removed from the solid?
- How does delta G affect keq?

- 98% accuracy study help
- Covers math, physics, chemistry, biology, and more
- Step-by-step, in-depth guides
- Readily available 24/7