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Tju [1.3M]
3 years ago
5

The specific heat of copper is 0.40 joules/ g °c. How much heat is needed in joules to change the temperature of a 55 gram subst

ance from 20.0 ° C to 74.0 °C ? c=.40 J/g °C.
I need it worked out pleaseee
Chemistry
1 answer:
Snezhnost [94]3 years ago
3 0

Answer : The amount of heat needed is, 1188 J

Explanation :

Formula used :

q=m\times c\times (T_2-T_1)

where,

q = heat needed = ?

m = mass of copper = 55 g

c = specific heat capacity of copper = 0.40J/g^oC

T_1 = initial temperature = 20.0^oC

T_2 = final temperature = 74.0^oC

Now put all the given values in the above formula, we get:

q=55g\times 0.40J/g^oC\times (74.0-20.0)^oC

q=1188J

Thus, the amount of heat needed is, 1188 J

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Answer:

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solution

we know when any base more than 0.05 (HNO2) than exceed buffer capacity

and when any base more than 0.075 (KNO2) than exceed buffer capacity

when we add 250 mg NaOH (0.250 g)

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mol NaOH  = 0.00625 mol

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and

when we add 350 mg KOH (0.350 g)

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and

now we  add 1.25 g HBr

than molar mass HBr = 80.91 g/mol

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