Subjects
PRICING
COURSES
SIGN IN
Start Free Trial
Shubham G.
Best Tutor for 3 years
Tutor Satisfaction Guarantee
Physical Chemistry
TutorMe
Question:

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is (A) Br2(g) (B) Cl2(g) (C) H2O(g) (D) CH4(g)

Shubham G.
Answer:

B The standard molar enthalpy of formation of elements in standard state is zero. For chlorine standard state is gas. Br2 in standard state is liquid. H20 is liquid. Ch4 is CO2+H20

Organic Chemistry
TutorMe
Question:

How is aldehyde different from a ketone?

Shubham G.
Answer:

An aldehyde molecule has a carbonyl group -(C=0)- at the end of a carbon chain. A ketone has a carbonyl group -(C=0)- inside a carbon chain.

Trigonometry
TutorMe
Question:

As trignometry is all about identity relations, so PROOV: tan^2(x) - sin^2(x) = tan^2(x) sin^2(x)

Shubham G.
Answer:

tan^2(x) - sin^2(x) = sin^2(x) / cos^2(x) - sin^2(x) = [ sin^2(x) - cos^2(x) sin^2(x) ] / cos^2(x) = sin^2(x) [ 1 - cos^2(x) ] / cos^2(x) = sin^2(x) sin^2(x) / cos^2(x) = sin^2(x) tan^2(x)

Send a message explaining your
needs and Shubham will reply soon.
Contact Shubham
Ready now? Request a lesson.
Start Session
FAQs
What is a lesson?
A lesson is virtual lesson space on our platform where you and a tutor can communicate. You'll have the option to communicate using video/audio as well as text chat. You can also upload documents, edit papers in real time and use our cutting-edge virtual whiteboard.
How do I begin a lesson?
If the tutor is currently online, you can click the "Start Session" button above. If they are offline, you can always send them a message to schedule a lesson.
Who are TutorMe tutors?
Many of our tutors are current college students or recent graduates of top-tier universities like MIT, Harvard and USC. TutorMe has thousands of top-quality tutors available to work with you.