Entropy change as mass tends to infinity

'show that the entropy change of the object tends towards deltaQ/T (subcript i) as its mass tends to infinity, in the4 limit where it becomes a heat bath

i got:
change in entropy =mc ln (Tf/Ti) (mc ln (T subcript f/T subcript i))

but if the mass tends to inifinity the expression seems to blow up

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Andrew Mason
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'show that the entropy change of the object tends towards deltaQ/T (subcript i) as its mass tends to infinity, in the4 limit where it becomes a heat bath

i got:
change in entropy =mc ln (Tf/Ti) (mc ln (T subcript f/T subcript i))

but if the mass tends to inifinity the expression seems to blow up