# nikk

Popular questions and responses by nikk
1. ## Chemistry 2

When 5.0g of CaCl2 was dissolved in 50 ml of water in a coffee cup calorimeter, the temperature of the solution rose from 22.3C to 30.5C. What is the qsoultion in J and what is the qrxn in J? What is the deltaH in kJ/mol of CaCl2 dissolved?

2. ## math

what is the quotient (2.965 x 10 ^7) divided by (5 x 10^3)?

3. ## Chemistry

Calculate the standard free energy of the following reactions at 25C, using standard free energies of formation. a. C2H4(g)  3O2(g) ±£ 2CO2(g)  2H2O(l) b. CaCO3(s)  2H(aq) ±£ Ca2(aq)  H2O(l)  CO2(g)

4. ## Chemistry 2

Given the following information at 25C, calculate G at 25 degrees Celsius 2A(g)  B(g) ±£ 3C(g) Substance Hf  (kJ/mol) S(J/molK) A(g) 191 244 B(g) 70.8 300 C(g) -197 164 a. -956 kJ b. 956 kJ c. 346 kJ d. 346 kJ e. -1.03 * 10^3 kJ

1. ## Math

10

posted on October 15, 2017
2. ## Chemistry 2

thank you

posted on September 21, 2015
3. ## math

@ms.sue plz help

posted on October 14, 2014
4. ## Physics

A man weighing 700 N lifts a 50.0 N object 2.0 m high. He uses a lever and with a force of 10.0 N. What is the resistance force? Answer: 50.0 N

posted on January 24, 2014