Chemistry Homework Help

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Units of Energy

Q. Suppose that a person eats a diet of 2385 Calories per day. Convert this energy into J. Express your answer using four significant figures.

Solved • Apr 15, 2020

Units of Energy

Q. The nutritional calorie (Calorie) is equivalent to 1 kcal. One pound of body fat is equivalent to about 4.1 x 10^3 Calories. If a runner expends 1850 kJ/h, how long (h) does she have to run work off 7.57 lb of body fat? Enter your answer in decimal format with one decimal place.

Solved • Mar 30, 2020

Units of Energy

Q. The nutritional calorie (Calorie) is equivalent to 1 kcal. One pound of body fat is equivalent to about 4.10 x 10^3 Calories. If a runner expends 1850 kJ/h, how long (h) does she have to run to work off 6.05 lb of body fat? Enter your answer in decimal format with one decimal place.

Solved • Mar 23, 2020

Units of Energy

Q. How many joules are released when 1.00 mol of 239-Pu decays if each nucleus releases 5.243 MeV? Enter your answer in scientific notation.

Solved • Nov 26, 2019

Units of Energy

Q. How many MeV are released per nucleus when 2.60 x 10^-3 mol of chromium-49 releases 8.11 x 10^5 kJ?

Solved • Nov 26, 2019

Units of Energy

Q. Arsenic-84 decays with an energy of 1.57 x 10^-15 kJ per nucleus. (a) Convert this energy into electron volts: Enter your answer in scientific notation. (b) Convert this energy into MeV:

Solved • Nov 26, 2019

Units of Energy

Q. A 3-H nucleus decays with an energy of 0.018888 MeV. Convert this energy into (a) electron volts; (b) joules. Enter your answer in scientific notation.

Solved • Nov 26, 2019