The energy content for 100ml of a standard infant formula made according to directions is:[Fill in the blank]单项选择题
A
a. 250kJ
B
b. 280kJ
C
c. 310kJ
D
d. 340kJ

Question

The energy content for 100ml of a standard infant formula made according to directions is:[Fill in the blank]

BlackTom AI · Accepted Answer

Standard infant formula prepared to the manufacturers’ standard concentration contains about 67 kcal per 100 ml, which is the key energy-density fact used here.

1. Relevant knowledge points and concepts
- Typical energy density of standard infant formula ≈ 67 kcal/100 ml (designed to approximate breastmilk).
- Energy unit conversion: 1 kilocalorie (kcal) = 4.184 kilojoules (kJ).

2. Step‑by‑step reasoning
- Start from the known value in kcal (67 kcal per 100 ml).
- Convert kcal to kJ using the conversion factor.

3. Calculations with intermediate steps
- Multiply: 67 kcal × 4.184 kJ/kcal
- Break into parts: 67 × 4 = 268
- And 67 × 0.184 = 12.328
- Sum: 268 + 12.328 = 280.328 kJ
- Round to a sensible reporting precision for nutrition labels: ≈ 280 kJ per 100 ml.

4. Why the correct answer is correct
- The conversion shows 67 kcal corresponds to ≈280.3 kJ, so the nearest option 280 kJ is the correct representation of standard formula energy content per 100 ml.

5. Why the other options are incorrect
- a. 250 kJ would correspond to ~59.8 kcal (250 ÷ 4.184 ≈ 59.8 kcal), lower than the standard formula energy density.
- c. 310 kJ corresponds to ~74.1 kcal, higher than typical standard formula.
- d. 340 kJ corresponds to ~81.3 kcal, well above the usual value.
- None of these match the established 67 kcal/100 ml value and its correct conversion.

6. Conclusion
- Therefore the correct choice is b. 280 kJ, which matches the provided answer.

The energy content for 100ml of a standard infant formula made according to directions is:[Fill in the blank]单项选择题

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