An ice cream has a marked value of 700 kcal. How may kilowatt-hour of energy will it deliver to the body as it is degested.

Options

A. 0.81 kWh
B. 0.90 kWh
C. 1.11 kWh
D. 0.71 kWh

Answer

To solve the problem of how many kilowatt-hours of energy an ice cream with a marked value of 700 kcal will deliver to the body as it is digested, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Energy Value**:
The ice cream has a marked energy value of 700 kcal.

2. **Convert kcal to Joules**:
We need to convert the energy from kilocalories to joules. The conversion factor is:
\[ 1 \text{ kcal} = 4.2 \text{ kJ} = 4200 \text{ J} \]
Therefore, for 700 kcal:
\[ \text{Energy in Joules} = 700 \text{ kcal} \times 4200 \text{ J/kcal} = 2,940,000 \text{ J} \]

3. **Convert Joules to Kilowatt-hours**:
Now, we need to convert joules to kilowatt-hours. The conversion factor is:
\[ 1 \text{ kWh} = 3.6 \times 10^6 \text{ J} \]
To find the energy in kilowatt-hours:
\[ \text{Energy in kWh} = \frac{2,940,000 \text{ J}}{3.6 \times 10^6 \text{ J/kWh}} \approx 0.81667 \text{ kWh} \]

4. **Final Result**:
Thus, the energy delivered to the body by the ice cream as it is digested is approximately:
\[ 0.82 \text{ kWh} \text{ (rounded to two decimal places)} \]

### Summary:
The ice cream delivers approximately **0.82 kWh** of energy to the body upon digestion.