Please help I’m stuck b. Water has a specific heat of 4.184 J/gºC. If the temperature of 250 g of
water changes from 22.9°C to 14.7°C, how much heat energy was removed
from the water?

C. A sample of aluminum (c = 0.900 J/gºC) is heated from 20.8°C to 38.7 °C
using 3,750 J of energy. What is the mass of the aluminum sample?

d. Determine the final temperature of sample with a specific heat of 1.1 J/gºC
and a mass of 385 g if it starts out at a temperature of 19.5°C and 885 J of
energy are added to it.

gas

explanation:

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They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab. 

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.