Questions by Cheng Sun

Questions by Cheng Sun

Given: N2 + 3H2 → 2NH3 Bond Bond Energy (kJ/mol) N≡N 942 H–H 432 N–H 386 Use the bond energies to calculate the change in enthalpy for the reaction. The enthalpy change for the reaction is ____ kilojoules.

asked Jul 2, 2020

2 answers

0 votes

43.4k views

Lena had an earthworm that was 56 cm long. The earthworm grew another 120 mm. How long is Lena's earthworm now? Give your answer in mm. mm

asked Mar 12, 2020

1 answer

1 vote

18.5k views

How does Douglass use parallelism in this excerpt? to establish that as a former slave he has the authority to discuss this topic to communicate important background information about slavery in America

asked Aug 23, 2019

2 answers

1 vote

63.4k views

Eric is more likely than his sister to be negatively affected by x-linked disorders because __________.

asked Feb 13, 2019

1 answer

4 votes

146k views

The difference in composition between a weak base and its conjugate acid is

asked Dec 13, 2018

1 answer

4 votes

63.9k views

The paintings of William Blake were based on:

asked Nov 7, 2018

2 answers

1 vote

86.5k views

Student enrollment at a school has dropped to 504, at 20% decrease. What was the student enrollment the previous year?

asked Oct 26, 2017

1 answer

2 votes

188k views

How do hydrogen bonds hold DNA together?

asked Sep 4, 2017

1 answer

2 votes

221k views

What is 855,000,000,000 in scientific notation?

asked Jul 8, 2017

2 answers

1 vote

223k views

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