Two solutions, initially at 24.69°c, are mixed in a coffee cup calorimeter (ccal = 105.5 j/°c). when a 200.0 ml volume of 0.100 m agno3 solution is mixed with a 100.0 ml sample of 0.100 m nacl solution, the temperature in the calorimeter rises to 25.16°c. determine the dh°rxn, in units of kj/mol agcl. assume that the density and heat capacity of the solutions is the same as that of water.

a. -78 kj/mol agcl
b. -25 kj/mol agcl
c. -64 kj/mol agcl
d. -32 kj/mol agcl
e. -59 kj/mol agcl

The correct answer is option c.

Explanation:

Specific heat of water =  4.18 J/g°C

Density of water = 1 g/ml

Mass of solution ,m'=

Mass of solution ,m''=

Since NaCl solution is present in lessor mass so, it will act limiting reagent.

Heat absorbed by the solution

Heat absorbed by the calorimeter ,

Heat released during reaction,=49.585 J+589.38 J=638.965 J

As we know that NaCl is present as limiting reagent, the product will form according to the availability of NaCl.

Moles of NaCl in 100.0 ml of 0.100 solution = 0.01 moles

1 mol of NaCl gives 1 mol of AgCl, then 0.01 mol of NaCl will give 0.01 mol of AgCl

Heat of the reaction per 1 mol of AgCl =

The heat released during the reaction that exothermic reaction's is negative.

Hence the correct answer is option c.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.