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
Does anyone know how to do the alien periodic table im stuck and cant go furhter
adell [148]

Answer:

i never heard of it

Explanation:

7 0
2 years ago
A 66.4 gram sample of Ba(ClO4)2 3 H2O was heated thoroughly in a porcelain crucible, until its weight remained constant. After h
PSYCHO15rus [73]

Answer:

57.2 g

Explanation:

First we <u>convert 66.4 grams of Ba(ClO₄)₂·3H₂O into moles</u>, using its <em>molar mass</em>:

  • Molar mass of Ba(ClO₄)₂·3H₂O = Molar mass of Ba(ClO₄)₂ + (Molar Mass of H₂O)*3
  • Molar mass of Ba(ClO₄)₂·3H₂O = 390.23 g/mol
  • 66.4 g ÷ 390.23 g/mol = 0.170 mol Ba(ClO₄)₂·3H₂O

0.170 moles of Ba(ClO₄)₂·3H₂O would produce 0.170 moles of 0.170 moles of Ba(ClO₄)₂. Meaning we now <u>convert 0.170 moles of Ba(ClO₄)₂ into grams,</u> using the molar mass of Ba(ClO₄)₂:

  • 0.170 mol * 336.23 g/mol = 57.2 g
3 0
2 years ago
Which element is commonly found in meteorites
MA_775_DIABLO [31]
The element that is commonly found in meteorites is oxygen
3 0
2 years ago
Read 2 more answers
Find the number of cations present in 7g of sodium prosphate Na=23 g/mol O=16g/mol P=31g/mol​
Snowcat [4.5K]

Answer:    This contains magnesium, Mg2+, and hydroxide, OH–

, ions. Each magnesium ion is +2 and

each hydroxide ion is -1: two -1 ions are needed for one +2 ion, and the formula for magnesium

hydroxide is Mg(OH)2. The (OH)2 indicates there are two OH–

ions. In a formula unit of

Mg(OH)2, there are one magnesium ion and two hydroxide ions; or one magnesium, two

oxygen, and two hydrogen atoms. The subscript multiplies everything in ( )

hope that helped!!

3 0
3 years ago
Chemical reactions that ____ energy will not occur without a source of energy
andrezito [222]
Chemical reactions that release energy will not occur without a source of energy.  So the answer is release.
4 0
3 years ago
Other questions:
  • A newspaper headline says that the average home uses about 30 kilowatt-hours per day. What is a kilowatt?
    12·2 answers
  • generally speaking electrons are found in shells which we also call principal energy levels located at increasing distances from
    15·1 answer
  • 22.5 mL of an HNO3 solution were titrated with 31.27 mL of a .167 M NaOH solution to reach the equivalence point. What is the mo
    10·1 answer
  • The element chlorine has two stable isotopes, chlorine-35 with a mass of 34.97 amu and chlorine-37 with a mass of 36.95 amu. Fro
    7·1 answer
  • CHEM HELP PLSSSSS, I SUCK AT CHEM
    5·1 answer
  • Maximum number of possible structural of C7H9N
    12·1 answer
  • PLEASE HELP!!!!!!!! giving brainlist
    9·2 answers
  • You have 30.4 g of O2 gas in a container with twice the volume as one with CO2 gas. The pressure and temperature of both contain
    7·1 answer
  • If you are heating something, you can step away for a moment, as long as you come back very quickly.
    15·1 answer
  • The normal boiling point of fingernail polish remover is 56℃. what is the vapor pressure of fingernail polish remover at the sal
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!