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CBSE Class 12-science Answered

How much positive and negative charge is there in a cup of water?
Asked by brigitha | 15 Mar, 2015, 09:33: PM
answered-by-expert Expert Answer
Let us consider that one cup of has 250 ml of water
Density of water is 1 g/cc in cgs system
Therefore the mass of one cup of water = 250 g
Molecular weight of water =18 g
 
begin mathsize 14px style Number space of space moles space of space water space in space 250 space gram space equals space 250 over 18 equals 13.888 space moles We space know space that space one space mole space equals space 6.02 space cross times 10 to the power of 23 space molecules The space number space of space molecules space in space one space cup space of space water space equals space 13.888 cross times 6.02 cross times 10 to the power of 23 equals 8.36 cross times 10 to the power of 24 space molecules 1 space molecule space of space water space equals space 2 space hydrogen space left parenthesis space 2 space protons right parenthesis space plus space 1 space oxygen space left parenthesis 8 space protons right parenthesis Total space protons space in space one space water space molecule space equals 10 space equals space Total space number space of space electrons Total space positive space and space negative space charge space has space the space same space magnitude We space know space charge space of space proton space equals 1.6 cross times 10 space to the power of negative 19 end exponent space straight C Total space positve space charge space in space 250 space straight g space of space water space in space cup space equals space 10 cross times 8.36 cross times 10 to the power of 24 space cross times 1.6 cross times 10 space to the power of negative 19 end exponent space space equals 1.338 cross times 10 to the power of 7 space straight C So space in space one space cup space of space water space left parenthesis 250 space ml right parenthesis space there space are space 1.338 cross times 10 to the power of 7 space straight C space positive space charge space and space space minus 1.338 cross times 10 to the power of 7 space straight C space negative space charge Totally space they space will space be space neutral space space end style
Answered by Jyothi Nair | 16 Mar, 2015, 11:04: AM

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