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22.10.2019 •
Chemistry
Aresearcher studying the nutritional value of a new candy places a 4.70g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen.the observed temperature increase is 2.46 c . if the heat capacity of the calorimeter is 40.50kj•k-1, how many nutritional calories are there per gram of the candy
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Ответ:
Calories of candy = 5.1 kcal /g
Explanation:
Given data:
Mass of candy = 4.70 g
Change in temperature = 2.46 °C
Specific heat capacity of calorimeter = 40.50 Kj/°C
Calories present per gram = ?
Solution:
Formula
Cal of candy = specific heat capacity × change in temperature / mass
C = c . ΔT/m
C = 40.50 Kj/°C × 2.46 °C / 4.70 g
C = 99.63 kj /4.70 g
C = 21.2 kj/ g
C = 21.2 kj/ g × 0.239 kcal/kj
C = 5.1 kcal /g
Ответ:
2)chemical composition
3)colour temperature
4)periodicy