About how many calories are required to convert 2g of ice at 0 °C to water vapor at 50 °C?
A) 160
B) 670
C) 1340
D) 1180
E) 2768

Question

Quizplus · Accepted Answer

To solve this problem, we need to use the formula:

Q = m × ΔH

Where:
Q = energy required (in calories)
m = mass (in grams)
ΔH = enthalpy of transformation

First, we need to calculate the energy required to convert 2g of ice at 0 °C to liquid water at 0 °C:

Q = 2g × 80 cal/g = 160 cal

Then, we need to calculate the energy required to heat the liquid water from 0 °C to 50 °C:

Q = 2g × 1 cal/g°C × 50°C = 100 cal

Finally, we need to calculate the energy required to convert the liquid water at 50 °C to water vapor at 50 °C:

Q = 2g × 540 cal/g = 1080 cal

Adding all these energies together, we get:

Qtotal = 160 cal + 100 cal + 1080 cal = 1340 cal

Therefore, the answer is C: 1340.

About How Many Calories Are Required to Convert 2g of Ice