7) find ah° for the reaction c3hg(8) + 5 o2(8) - 3 co2(8) + 4 h2o(l). ah° = -2046 kj for the reaction: c3h8(8) + 5 o2(8) - 3 co2(g) + 4h2o(8) the heat of vaporization of water is 44.0 kj/mol. the standard enthalpy of formation of water and water vapor are -285.9kj/mol and -241.8 kj/mol, respectively. note that h20 is a liquid in the first reaction and a gas in the second. 0-1870 kj 0- kj o-2002 kj 0-2090 kj

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. 

Acovalent bond is formed between the two hydrogen bonds

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Change in speed or direction : )