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A-heat-transfer-of-9-0-10-5-J-is-required-to-convert-a-block-of-ice-at-20-C-to-water-at-15-C-what-was-the-mass-of-the-block-of-ice-




Question Number 192472 by Mastermind last updated on 19/May/23
A heat transfer of 9.0×10^5 J is required  to convert a block of ice at 20°C to  water at 15°C, what was the mass of  the block of ice ?
$$\mathrm{A}\:\mathrm{heat}\:\mathrm{transfer}\:\mathrm{of}\:\mathrm{9}.\mathrm{0}×\mathrm{10}^{\mathrm{5}} \mathrm{J}\:\mathrm{is}\:\mathrm{required} \\ $$$$\mathrm{to}\:\mathrm{convert}\:\mathrm{a}\:\mathrm{block}\:\mathrm{of}\:\mathrm{ice}\:\mathrm{at}\:\mathrm{20}°\mathrm{C}\:\mathrm{to} \\ $$$$\mathrm{water}\:\mathrm{at}\:\mathrm{15}°\mathrm{C},\:\mathrm{what}\:\mathrm{was}\:\mathrm{the}\:\mathrm{mass}\:\mathrm{of} \\ $$$$\mathrm{the}\:\mathrm{block}\:\mathrm{of}\:\mathrm{ice}\:? \\ $$
Answered by MikeH last updated on 19/May/23
Q = mc_i (20−0)+ ml+mc_w (15−0)  ⇒ m = (Q/(20c_i +l+15c_w ))  c_i  = specific heat capacity of ice  c_w  = specific heat capacity of water  l = laten heat of fusion of ice
$${Q}\:=\:{mc}_{{i}} \left(\mathrm{20}−\mathrm{0}\right)+\:{ml}+{mc}_{{w}} \left(\mathrm{15}−\mathrm{0}\right) \\ $$$$\Rightarrow\:{m}\:=\:\frac{{Q}}{\mathrm{20}{c}_{{i}} +{l}+\mathrm{15}{c}_{{w}} } \\ $$$${c}_{{i}} \:=\:\mathrm{specific}\:\mathrm{heat}\:\mathrm{capacity}\:\mathrm{of}\:\mathrm{ice} \\ $$$${c}_{{w}} \:=\:\mathrm{specific}\:\mathrm{heat}\:\mathrm{capacity}\:\mathrm{of}\:\mathrm{water} \\ $$$${l}\:=\:\mathrm{laten}\:\mathrm{heat}\:\mathrm{of}\:\mathrm{fusion}\:\mathrm{of}\:\mathrm{ice} \\ $$
Commented by Mastermind last updated on 20/May/23
Thank you so much
$$\mathrm{Thank}\:\mathrm{you}\:\mathrm{so}\:\mathrm{much} \\ $$

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