I suck at this stuff soo 1. A student heated 100 mL of water from 0℃ to 50℃. How much energy did she use to heat the water?

2. Raquelle combines 3 volumes of water. She combines 50 mL of 10℃ water, 50 mL of 45℃ water, and 50 mL of 35℃ water. What is the final volume and temperature of the water?

Hcn is the correct answer leave a good rate and .

Ithink it is +1hope this

  the volume of  0.220 m k2s    solution  required  to  completely  react with 175 ml  of 0.115m co(no3)2  calculate the moles  of co(no3)2 =  molarity x volume/1000175 x0.115/1000= 0.02  moleswrite  the reacting  equationk2s(aq)  +  co(no3)2  = 2 kno3(aq)  + cos(s)by  use  of mole ratio between k2s to co(no3)2 which  is  1: 1 the moles of k2s is therefore = 175  x0.115/1000= 0.02  molesvolume = moles/molarity=0.02/0.22=0.09  ml  of k2s