00:01
Hello students, we are given by a question and the question is that sodium is reacting with water and the amount of sodium is 0 .754 gram.
00:08
Amount of water is 100 gram.
00:10
The initial temperature is 25 degrees celsius and the final temperature is 38 .75 degrees celsius.
00:17
And the specific heat capacity of sodium is also given which is 4 .18 jule per gram degree celsius.
00:24
Now we have to find the enthalpy change in clodule per mole and we have to find that the reaction is exothermic.
00:30
Endothermic and we have to find the heat release if 0 .56 gram of sodium is used.
00:37
So we start with the first part of the question.
00:40
So in the first part of the question we have to find the enthalpy and the formula for the enthalpy change is delta h or q is equals to m c into delta t.
00:54
So now we have to put the values in the formula so m is the mass of the metal piece which is 0 .754 gram multiply by the specific heat capacity is 4 .18 jule per gram degree celsius and the delta t is the temperature difference which is t 2 minus t 1 and when we calculate the t 2 minus t 1 that will be equals to 13 .75 degrees celsius so when we calculate this value it comes out to be 43 40 3 .33 jule but we have to find the delta h in kilojule per mole so we have to convert it into the kilojoule per mole so we have to divide it by thousand and the moles of the sodium so firstly we have to find the moles of the sodium so the moles of sodium metal will be equals to the given weight of the sodium metal which is 0 .754 gram divided by the atomic mass of sodium which is 23 gram per and when we calculate this value, the moles of sodium is found to be 0 .0 .327 moles.
02:07
Now we have to convert it delta h into the kilojoule per mole...