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
Anastasy [175]
4 years ago
9

The great French chemist Antoine Lavoisier discovered the Law of Conservation of Mass in part by doing a famous experiment in 17

75. In this experiment Lavoisier found that mercury(II) oxide, when heated, decomposed into liquid mercury and an invisible and previously unknown substance: oxygen gas.
Chemistry
1 answer:
storchak [24]4 years ago
6 0

Complete Question:

1. Write a balanced chemical equation, including physical state symbols, for the decomposition of solid mercury(II) oxide (HgO) into liquid mercury and oxygen gas.

IthaloAbreu

2. Suppose 59.0 mL of dioxygen gas are produced by this reaction, at a temperature of 90.0°C and a pressure of exactly 1 atm. Calculate the mass of mercury (II) oxide that must have reacted.

Answer:

1. 2HgO(s) → 2Hg(l) + O₂(g)

2. 0.8664 g

Explanation:

1. The reaction will be:

HgO(s) → Hg(l) + O₂(g)

To balance the equation, all the elements must have the same amount at both sides of the equation, so HgO and Hg must be multiplied by 2:

2HgO(s) → 2Hg(l) + O₂(g)

2. By the ideal gas law, we can find how many moles of O₂ was produced:

PV = nRT

Where P is the pressure (1 atm), V is the volume (59.0 mL = 0.059 L), n is the number of moles, R is the gas constant (0.082 atm.L/mol.K), and T is the temperature (90.0°C = 363 K).

1*0.059 = n*0.082*363

29.766n = 0.059

n = 0.002 mol

By the stoichiometry of the reaction:

2 moles of HgO ------------------ 1 mol of O₂

          x               ------------------ 0.002 mol

By a simple direct three rule:

x = 0.004 mol of HgO

The molecular mass of HgO is 216.59 g/mol. The mass is the number of moles multiplied by the molecular mass:

m = 0.004 * 216.59

m = 0.8664 g

You might be interested in
What does the number of valence electrons determine?
N76 [4]

Valence electrons are the electrons in the outermost shell of an element on the periodic table. Atoms want to be able to have a full outer shell and they can share or trade electrons in order to achieve this. Valence electrons are also super super important in chemical reactions. The number of valence electrons determines what group that specific atom or element is in on the periodic table. This affects the reactivity of the element.

4 0
4 years ago
As much as 25 percent of the fruits and vegetables grown in Chinese agricultural regions rot before they can be transported the
gulaghasi [49]

C. Developing effective methods of food preservation

Explanation:

The development of effective methods of food preservation is a much more smaller and manageable problem that contributes to the complex problem.

The percentage of food rotting is not as a result of lack of an effective preservation technique as highlighted in the passage. It is due to the long distances of agricultural area from where the farms are located.

  • To cut the loss, efficient and rapid transportation techniques needs to be put in place to carry the fruits and vegetables to the area where they are needed.
  • This is the most complex problem that if solved can peg back food rot.
  • Additional measures should be put in place to preserve the food.

Other options does not address the subject matter  

learn more:

Preservation brainly.com/question/4853419

#learnwithBrainly

7 0
3 years ago
Lithium, sodium and potassium all belong to the same group of the periodic table.
Lady_Fox [76]

Answer:

Yes they are found in same period

4 0
3 years ago
Read 2 more answers
You go to the same school as me BAHAHHAHA
Reptile [31]
Oh my i really hope no one from my school sees my comments
4 0
3 years ago
Consider these changes.
Ede4ka [16]

Answer:

(a) The system does work on the surroundings.

(b) The surroundings do work on the system.

(c) The system does work on the surroundings.

(d) No work is done.

Explanation:

The work (W) done in a chemical reaction can be calculated using the following expression:

W = -R.T.Δn(g)

where,

R is the ideal gas constant

T is the absolute temperature

Δn(g) is the difference between the gaseous moles of products and the gaseous moles of reactants

R and T are always positive.

  • If Δn(g) > 0, W < 0, which means that the system does work on the surroundings.
  • If Δn(g) < 0, W > 0, which means that the surroundings do work on the system.
  • If Δn(g) = 0, W = 0, which means that no work is done.

<em>(a) Hg(l) ⇒ Hg(g)</em>

Δn(g) = 1 - 0 = 1. W < 0. The system does work on the surroundings.

<em>(b) 3 O₂(g) ⇒ 2 O₃(g) </em>

Δn(g) = 2 - 3 = -1. W > 0. The surroundings do work on the system.

<em>(c) CuSO₄.5H₂O(s) ⇒ CuSO₄(s) + 5H₅O(g) </em>

Δn(g) = 5 - 0 = 5. W < 0. The system does work on the surroundings.

<em>(d) H₂(g) + F₂(g) ⇒ 2 HF(g)</em>

Δn(g) = 2 - 2 = 0. W = 0. No work is done.

3 0
3 years ago
Other questions:
  • What ion is formed when an atom of magnesium (mg) loses two electrons? mg–1 mg–2 mg 1 mg 2
    11·2 answers
  • Explain why vegetables last longer in a fridge.
    15·2 answers
  • Which temperature scale does not possess negative values? A. Fahrenheit B. Celsius C. Kelvin D. No temperature scale has negativ
    13·1 answer
  • Equation of ethane to ethanoic acid
    15·1 answer
  • Which of the following representations shows how one variable changes in response to another variable?
    15·2 answers
  • PLEASE HELP QUICK!
    10·1 answer
  • PLS HELP
    9·2 answers
  • What volume (in liters) does 3.91<br> moles of nitrogen gas at 5.35 atm<br> and 323 K occupy
    14·1 answer
  • A compound with an approximate molar mass of
    12·1 answer
  • Of what four things are bones made
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!