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/sci/ - Science & Math

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1999431 No.1999431 [Reply] [Original]

Hey /sci/, need some help with a college pre-lab. It's finding delta H for a reaction. This is all they gave us.

Mg(s) + 2HCL(aq) ---> MgCl2(aq) + H2(g)

the magnesium weighs .153 g; Ti = 24.3 C; Tf = 38.5 C

I really don't see how I'm supposed to figure this out with a specific heat.

>> No.1999437

Find the change in enthalpy?

>> No.1999444

>>1999437

They didn't give us the change in enthalpy for the reaction

>> No.1999451

What does H represent?

>> No.1999459

>>1999451

Enthalpy

>> No.1999485

>>1999431

Look up heats of formation for HCl, MgCl, and H2 (elemental Mg has a heat of formation of zero). (Products) - (Reactants), all that jazz. Receive Delta H.

Also, this sounds awfully like what our freshies are doing right now in Gen Chem...

>> No.1999497

>>1999485

Thanks.

Well, that's probably because I am in Gen Chem