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匿名 發問於 科學及數學化學 · 1 十年前

set up a experiment

enthalpy of formation - a planning experiment

Aim:The purpose of theis experiment is to setermine the enthalpy of formation of calcium carbonate.

Chemical and apparatus

each of you are given common chemical apparatus and the following chemicals

1.calcium metal(about 1g)

2.calcium carbgonate solid (about 3g)

3. 1.0M hydrochloric acid (about 250cm^3)

點樣做個實驗先搵到個enthaply of formation ??

A) Ca& HCl

B) CaCO3&HCL

唔該晒\\~~)\\

2 個解答

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  • 1 十年前
    最愛解答

    I will do this tmr ...so I think it may be like this

                (p1)

    Ca ( s) +C (graphite) (s) + 3/2 O2 (g)--------------->CaCO3 (s)

    ! (p5) *************** ! (p4)********************************* /

    ! +2HCI ************ ! ******* ***************** ********** /+2HCI

    ! ********************* ! ******* ***************** **********/

    V ********************V ******* ***************** ********/(p2)

    CaCI2(aq)+H2(g) + CO2+1/2 O2(g) ******* **********/

    ****************** ! ******* ***************** ***********/

    ****************** ! (p3) ******* ********************* /

    ***************** V ******* **************************/

    CaCI2(aq)+CO2+H2O(l)        <---- /

    Enthalphy change of formation of calcium carbonate

    (p1)=(p5)+(p4)+(p3)-(p2)

    !!!e.g. (p1) = PATH 1.

    the position of the 2HCl ...you can put it within the arrow...or put it on each side of the (p1)

    such as below:

                (p1)

    2HCl(aq)+ Ca ( s) +C (graphite) (s) + 3/2 O2 (g)---------------> CaCO3 (s) +2HCl(aq)

    ..I hope it is right and it can help u la~~~

    regardless of the *****..just for keeping the space ,,,otherwise,every word would turn out to be very messy...

    資料來源: ME ar...I type it out ga!!!
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  • 1 十年前

    your science teacher will know.kk

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