Calculating enthalpy change 

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sir i have a doubt in the equation Q=mc(temp change) is m only the mass of water and liquids that have same density as water or the substances added like for example I have a solution of 20cm^3 and I add 4g of FB5( salt Na2A.5H2O) then do I add the mass of FB5 also to get Q=(20+4)*4.18*(temp change) or would I just do Q=20*4.18*(temp change) please answers I have my p3 exam tomorrow

That didn’t make any sense

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Thanks

hi what moles do i use if my experiment was for zinc with copper sulfate solution do i work out moles of copper sulfate? thanks

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