When calculating the equilibrium constant, aqueous solutes must be expressed in moles per liter (M). and gases must be expressed in pressure as bars. This is because A. there are no other ways to express pressure or concentration other than bars or moles per liter (M). B. they are dimensionless ratios of the actual concentration or pressure divided by standard state concentration, which is 1 M for solutions and 1 bar for gases. C. these are the only units of concentration and pressure that are independent of temperature. D. the dimensionless ratios are always unity (1) because the concentration of the solute or pressure of the gas are divided by standard state concentrations.

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. 

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