Calculating enthalpy change

[@andrewivey9209]

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[@hayabataineh4947]

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[@pepepeek_normalperson]

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[@gall2218]

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[@hayato-xm3mt]

life saver

[@nanasei3479]

Thank you

[@evendaking9610]

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[@rifannizar8629]

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

[@1babyborn]

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

[@sugansweet2645]

Yeah

[@toniozel9936]

Im doing that question now I'm trying to figure that out

[@Mrfosuissac]

Thanks

[@hedayakhateeb1730]

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[@yemin5564]

That didn’t make any sense