Question

How many moles of mercury were heated if the change in enthalpy is 5 kJ, the specific heat is 71.1 J/molK and the heat increases by 100 K?

Answer 1

To find the number of moles of mercury that were heated, we can use the formula: ΔH = q / (n × C × ΔT). By rearranging the formula, we can solve for n: n = q / (ΔH × C × ΔT).

Step-by-step explanation:

To find the number of moles of mercury that were heated, we can use the formula:

ΔH = q / (n × C × ΔT)

Where:

• ΔH is the change in enthalpy, which is given as 5 kJ
• q is the heat, which is unknown
• n is the number of moles of mercury, which we need to find
• C is the specific heat, which is given as 71.1 J/molK
• ΔT is the change in temperature, which is given as 100 K

By rearranging the formula, we can solve for n:

n = q / (ΔH × C × ΔT)

Substituting the given values:

n = q / (5 kJ × 71.1 J/molK × 100 K)

n = q / (355 kJ)

Therefore, the number of moles of mercury heated, n, depends on the value of q, which is unknown.

Learn more about moles of mercury