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I am getting confused in this question;what i learned till now is thatnumber of proton+number of neutron=atomic mass. But while searching the net i got this equation

atomic mass = mass a x fract a + mass b x fract b. can any one tell me which is the correct (not approximate) method for finding atomic weight.

and my second question

isweight of proton+weight of neutron= atomic massis this equation correct

advance thanks for your help

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# Whether sum of weight of proton and neutron is equal to atomic mass?

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