A calorimeter holds 125 g water at 31.0°C. A sample of hot copper is added to the water. The final temperature of the water and copper is 39.0°C. What is the change in enthalpy
associated with the change in the water's temperature? The specific heat capacity of
water is 4.19 J/gºC. Which substance had a positive q value?

idk

Explanation:

you did not give any options thus this is the best answer i can give to you with this little information you have given

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a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o