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Question

6 gm of steam at 100oC is mixed with 6 gm of ice at 0oC. The mass of steam left uncondensed

A
2 gm
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B
4 gm
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C
3 gm
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D
1 gm
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Solution

The correct option is B 4 gm
Suppose x qram steam get condensed then heat released Q0=mL=xLv=S40x cal

heat need to meet Q1=mLf=6×80=480 cal

heat to raise temp Q2=mSot=6×1×100=600 cal

total needed heat =Q1+Q2=1080 cal

but Q0=Q1+Q2 [conversation of energy]

so x=10805902gm=x uncondensed =62=4 gm

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