Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

baddinlol

  • 2 years ago

An 0.1250 g sample of methanol was burnt in a bomb calorimeter containing 100.0 mL of water. The temperature rose from 17.33 to 23.73° C. Calculate ∆ H for the combustion reaction.

  • This Question is Open
  1. .Sam.
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    \[\text{First find the heat of water, Q,} \\ \\ \text{They have given you} \\ \\ \text{V=100mL=100g} \\ \\ \text{ΔT=6.4°C}\] \[\text{Using the formula} \\ \\ \text{Q=mcΔT} \\ \\ Q=100(4.184)(23.73-17.33) \\ \\ Q=2677.76J\] \[\text{Now, Use this equation \to find ΔH for reaction} \\ \\ \Delta H = \frac{Q}{n} \\ \\ \text{The reaction requires 'n' which is number of moles of substance,} \\ \\ \text{We can find that by using the mass given,} \\ \\ n=0.125g~of~CH_3OH \times \frac{1~mol~of~CH_3OH}{32~g~of~CH_3OH}=3.91 \times 10^{-3}moles~of~CH_3OH\] \[\text{Using back the equation,} \\ \\ \Delta H=\frac{Q}{n}=\frac{2677.76J}{3.91 \times 10^{-3}mol}=684849J/mol~~~or~~~685kJ/mol\]

  2. baddinlol
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Thanks ! =)

  3. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.