Five kg of water is contained in a piston–cylinder assembly, initially at 5 bar and 360°C. The water is slowly heated at constant pressure to a final state. The heat transfer for the process is 2660 kJ and kinetic and potential energy effects are negligible. Determine the final volume, in m3, and the work for the process, in kJ.

Explanation:

Given that,

Mass = 5kg of water

Initial pressure P•i = 5bar = 500 kPa

Pressure is constant P = 5bar

Initial temperature T•i = 360°C

Heat transferred Q = 2660 KJ

Kinetic and potential energy are negligible

a. Final volume

The initial enthalpy and specific volume can be determine from the steam table.

h•1 = 3188.83 KJ/kg

v•1 = 0.5796 m³/kg.

So, we can calculate the final enthalpy by using

Q = m(h2—h•1)

2660 = 5 (h2—3188.83)

2660/5 = h2—3188.83

h2 — 3188.83 = 532

h2 = 520 + 3188.83

h2 = 3720.83 KJ/kg.

Using steam table, we can determine the final temperature and final specific volume

T•f = 608°C

v•f = 0.8115 m³/kg

Then, specific volume = volume /mass

v•f = v2/m

v2 = vf × m

v2 = 0.8115 × 5

v2 = 4.0575m³

b. Workdone?

W = m•P•(vf —vi)

W = 5 × 500(0.8115 — 0.5796)

W = 579.75 KJ

  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

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d