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
KonstantinChe [14]
2 years ago
11

How many atoms of mercury are required to produce 3.49 L of H2 gas (density =

Chemistry
1 answer:
Setler79 [48]2 years ago
6 0

The number of mercury atoms required to produce 3.49 L of H2 gas according to the equation would be 1.89 x 10^{23}

From the balanced equation of the reaction:

2Hg(l) + 2 HNO_3(aq) ---> Hg_2(NO_3)_2(aq) + H_2(g)

2 moles of Hg are required to produce 1 mole of the H2 gas.

3.49 L of H2 gas was produced and the density of the gas is 0.0899 g/L

Recall that: density = mass/volume

Mass of the H2 gas = density x volume

                                     = 3.49 x 0.0899

                                     = 0.3138 g of H2 gas

Mole of 0.3138 g of H2 gas = mass/molar mass

                                         = 0.3138/2

                                            = 0.1569 mole

Since the ratio of Hg to H2 according to the equation is 2:1, it means that the mole of Hg is twice the mole of H2.

Thus, mole of Hg = 0.1569 x 2

                                    = 0.3138 mole

According to Avogadro, 1 mole of a substance = 6.022×10^23

0.3138 mole would be:

                 0.3138 x 6.022 x 10^23

                            = 1.89 x 10^{23}

More on the number of atoms in molecules can be found here: brainly.com/question/19036641

You might be interested in
217 mL of neon gas at 551 celsius is brought to standard temperature (0 celsius) while the pressure is held constant. What is th
pantera1 [17]

Answer: The new volume is 72 ml

Explanation:

To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

\frac{V_1}{T_1}=\frac{V_2}{T_2}

where,

V_1\text{ and }T_1 are the initial volume and temperature of the gas.

V_2\text{ and }T_2 are the final volume and temperature of the gas.

We are given:

V_1=217ml\\T_1=551^oC=(551+273)K=824K\\V_2=?\\T_2=0^0C=(0+273)K=273K

Putting values in above equation, we get:

\frac{217ml}{824K}=\frac{V_2}{273K}\\\\V_2=72ml

Thus the new volume is 72 ml

7 0
2 years ago
Differences between hypothesis and theory​
Sphinxa [80]

Answer:

A hypothesis is either a suggested explanation for an observable phenomenon, or a reasoned prediction of a possible causal correlation among multiple phenomena. In science, a theory is a tested, well-substantiated, unifying explanation for a set of verified, proven factors.

Explanation:

He I hope this helps and hope I can brainliest answer

7 0
3 years ago
Read 2 more answers
4.2g of cerium reacted with oxygen to form 5.16g of an oxide of cerium. Find
olganol [36]

Answer:

CeO₂

Explanation:

Hello!

In this case, since we are given the mass of both cerium and the cerium oxide, we can first compute the moles of cerium and the moles of oxygen as shown below:

n_{Ce}=4.2gCe*\frac{1molCe}{140.12gCe}=0.03molCe\\

m_O=5.16g-4.2g=0.96gO\\\\n_O=0.96g*\frac{1molO}{16.0gO} =0.06molO

Now, we simply divide each moles by 0.03 as the fewest moles in the formula to obtain the simplest formula (empirical formula) of this oxide:

Ce=\frac{0.03}{0.03}=1\\\\O =\frac{0.06}{0.03}=2

Thus, the formula turns out:

CeO_2

Regards!

6 0
3 years ago
A student mixed a small amount of iron filings and sulphur powder in a dish. He could not
Temka [501]

Answer:

\huge \boxed{\mathrm{Carbon \ disulphide}}

Explanation:

Carbon disulphide is the liquid that can be used to separate iron fillings and sulphur powder.

When carbon disulphide is poured into the dish, the sulphur powder gets easily dissolved in the carbon disulfide. The iron fillings are left to settle on the bottom of the dish.

The iron fillings can get seperated through filtration. When the mixture of sulphur powder and carbon disulphide gets completely evaporated, the sulphur powder is left over.

7 0
3 years ago
What have all living things evolved from?
dedylja [7]
Earlier species thanks to evolution. hope this helped!

3 0
3 years ago
Read 2 more answers
Other questions:
  • Does the second picture answer the first one, if not what am i missing, I’m incredibly confused.
    12·1 answer
  • The answer to this question
    12·1 answer
  • The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion
    13·2 answers
  • The Balmer series consists of the spectral lines from hydrogen for an electron making a transition from an excited state to the
    11·1 answer
  • Which of these is an example of sexual reproduction, involving meiosis?
    11·2 answers
  • Cells can regulate different processes in two ways. They can turn on and off the genes that make enzymes, or they can
    15·1 answer
  • Wadadaaaaddddddddddddddddddddddddddd
    5·1 answer
  • Xavier boiled 19 grams of water. If all of the water changed into a gas, what would be the mass of the steam?
    13·1 answer
  • What process must occur to cause sediment to stick together when forming sedimentary rock?
    7·1 answer
  • An element with 3 valence electrons would be a
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!