1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Dovator [93]
3 years ago
10

A chemist measures the energy change ?H during the following reaction: 2HgO (s) ?2Hg (l) +O2 (g) =?H182.kJ Use the information t

o answer the following questions. This reaction is...
A. endothermic.
B. exothermic.

Suppose 72.8g of HgO react. Will any heat be released or absorbed?

A. Yes, absorbed.
B. Yes, released.
C. No.
Chemistry
1 answer:
Elan Coil [88]3 years ago
6 0

Answer:

A. endothermic.

A. Yes, absorbed.

Explanation:

Let's consider the following thermochemical equation.

2 HgO(s) ⇒ 2 Hg(l) + O₂(g)  ΔH = 182 kJ

The enthalpy of the reaction is positive (ΔH > 0), which means that the reaction is endothermic.

182 kJ are absorbed when 2 moles of HgO react (molar mass 216.59 g/mol). The heat absorbed when 72.8 g of HgO react is:

72.8g.\frac{1mol}{216.59g} .\frac{182kJ}{2mol} =30.6kJ/mol

You might be interested in
A Is an ecosystem that is covered with water for at least part of the year
ruslelena [56]
It could be a tide pool but this is pretty vague
4 0
3 years ago
How many grams of ethylene glycol (c2h6o2 must be added to 1.25 kg of water to produce a solution that freezes at -5.88 ∘c?
e-lub [12.9K]
The freezing point depression is calculated through the equation,
                                    ΔT = (kf)  x m 
where ΔT is the difference in temperature, kf is the freezing point depression constant (1.86°C/m), and m is the molality. Substituting the known values,
                                   5.88 = (1.86)(m)
m is equal to 3.16m

Recall that molality is calculated through the equation,
                                  molality = number of mols / kg of solvent
                                       number of mols = (3.16)(1.25) = 3.95 moles
Then, we multiply the calculated amount in moles with the molar mass of ethylene glycol and the answer would be 244.9 g.

6 0
2 years ago
If a man has a mass of 83 kilograms on Earth, what will the force of gravity on his body be on the moon? A. 135.6 N B. 318.5 N C
diamong [38]
First, we need to know what's the gravity value in the moon. it is 1.622 m/ s2

to find the force, let's recall this formula----> Force= mass x gravity

force= 83 kg x 1.622= 134.6

A is the closest choice.
4 0
3 years ago
Read 2 more answers
A 8.2 L sample of gas has a pressure of 0.8 atm at a temperature of 259 K. If the temperature increases to 301 K, causing the vo
Rina8888 [55]

The answer is 0.7 atm


8 0
3 years ago
Read 2 more answers
Ways to help our environment- please make it specific and explaining what to do and how to do it
Genrish500 [490]
You can pick up any garbage that you see. Talk to people and hear what their ideas are for helping the environmental.
6 0
2 years ago
Read 2 more answers
Other questions:
  • Do metals donate or accept electrons? what do they become after they donate/accept electrons?
    9·1 answer
  • i. Give two differences between a physical change and a chemical change. ii. Explain whether condensation of water vapor is a ph
    10·2 answers
  • A rigid tank contains 0.66 mol of oxygen (O2). Find the mass of oxygen that must be withdrawn from the tank to lower the pressur
    12·1 answer
  • Draw structural formula of a cyclic secondary alcohol with the molecular formula c3h6o.
    5·1 answer
  • Boron trifluoride gas is collected at in an evacuated flask with a measured volume of . When all the gas has been collected, the
    12·1 answer
  • What is the fancy psychological term for "mental process"?
    7·1 answer
  • Where do molecules humans need come from
    12·1 answer
  • Mối liên hệ giữa chuyển hóa protein và lipid ?
    7·1 answer
  • Which element of the third period had the highest first ionization energy?
    7·1 answer
  • As a rock falls, some of its potential energy is transformed into kinetic energy. What is true about the mechanical energy durin
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!