A) a closed insulated tank is used to heat 400 l of chemical for a production process. there is no loss of heat energy from the tank. given the density of the chemical is 1100 kg/m3, initial temperature of the chemical is 15°c, and the specific heat value of the chemical is 2.2 kj/(kg. k) how much heat energy is required to raise the temperature of the chemical (i) to 40°c? (15 marks) (ii) how long will it take to heat the chemical to 40°c using a 4 kw heater fully immersed in the chemical? assume 100 % efficiency for the heater. (10 marks) state the units for your answers.

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle