Recent content by chemadvisor

I mean when I say one assumption is that no heat is transferred between outside environment and the calorimetry then I can't say one error that can occur is that heat can be transferred between outside environment and calorimetry. I am really struggling with this can you tell me what are other...

So I know one assumption could be that calorimetry and the outside environment do not exchange energy. And one source of error could be the fact that foam cup is not isolated. but the thing is the assumption I made and the error kind of contradict each other, that's why I need help

I once read that when you have a solid that is added to a solution like water, you can't add the masses (reaction 1 and 2). Unless you have a solution, then you can add the solutions together (reaction 3). Am I right??

This is part of a lab procedure question. We are told that the specific heat capacity of the water remain roughly the same because the solution is dilute. Reaction 1- solid NaOH + water (aq) temperature change= 5.8 Reaction 2- Solid NaOH + HCl (aq) temperature change...

I just know that one assumption is that the specific heat capacity of water (as the surrounding) stays the same (or the change in its heat capacity is negligible). Please Help me with the rest.

I put the correct temperature change in my last reply. Now, that temperature change is 5.8 for reaction one, is my answer to it correct?

How would I use this hint to solve this question? can you explain more

my bad! Reaction 1 -> Ti= 25 Tf= 30.8 delta T=5.8 Reaction 2 -> Ti=25 Tf=37.62 delta T=12.62 Raection 3 -> Ti=25 Tf=31.67 delta T= 6.67

Could you tell me the correct answer to 1?

reaction 1: Q=mc (delta T) -> Q= (50g)(4.18 J/g. C)(5.8 C)= 1212.2 J delta H= -Q -> delta H= -1212.2 J or -1.2122 kJ n (NaOH)= m/M n= (1.10 g) /( 39.997 g/mol) n= 0.0275 mol molar...

I am struggling to find the molar enthalpy change of reactions 2 and 3. I am confused what is the surrounding for reaction 2 and 3? what is the mass of the surrounding? I really need help with this. For reaction one I got: molar enthalpy change of NaOH is -44.07.