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
Triss [41]
3 years ago
14

Suppose we now collect hydrogen gas, H2(g), over water at 21◦C in a vessel with total pressure of 743 Torr. If the hydrogen gas

is produced by the reaction of aluminum with hydrochloric acid:
2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)



what volume of hydrogen gas will be collected if 1.35 g Al(s) reacts with excess HCl(aq)? Express



your answer in liters.

Chemistry
2 answers:
labwork [276]3 years ago
6 0

<u>Answer:</u> The volume of hydrogen gas that will be collected is 1.85 L

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass of aluminium = 1.35 g

Molar mass of aluminium = 27 g/mol

Putting values in above equation, we get:

\text{Moles of aluminium}=\frac{1.35g}{27g/mol}=0.05mol

For the given chemical reaction:

2Al(s)+6HCl(aq.)\rightarrow 2AlCl_3(aq.)+3H_2(g)

As, hydrochloric acid s present in excess. So, it is considered as an excess reagent.

Thus, aluminium is a limiting reagent because it limits the formation of products.

By Stoichiometry of the reaction:

2 moles of aluminium produces 3 moles of hydrogen gas

So, 0.005 moles of aluminium will produce = \frac{3}{2}\times 0.05=0.0750mol of hydrogen gas

To calculate the mass of helium gas, we use the equation given by ideal gas:

PV = nRT

where,

P = Pressure of hydrogen gas = 743 Torr

V = Volume of the helium gas = ?

n = number of moles of hydrogen gas = 0.075 mol

R = Gas constant = 62.364\text{ L Torr }mol^{-1}K^{-1}

T = Temperature of hydrogen gas = 21^oC=[21+273]K=294K

Putting values in above equation, we get:

743Torr\times V=0.075mol\times 62.364\text{ L Torr }mol^{-1}K^{-1}\times 294K\\\\V=1.85L

Hence, the volume of hydrogen gas that will be collected is 1.85 L

sukhopar [10]3 years ago
4 0

Answer:

\boxed{\text{1.90 L}}

Explanation:

1. Gather all the information in one place

M_r:   26.98

            2Al + 6HCl ⟶ 1AlCl₃ + 3H₂

m/g:     1.35

T = 21 °C

\: \, p_{\text{tot}} = \text{743 torr}\\p_{\text{H2O}} = \text{18.7 torr}

2. Moles of Al

\text{Moles of Al} = \text{1.35 g Al} \times \dfrac{\text{1 mol Al}}{\text{26.98 g Al}} = \text{0.050 04 mol Al}

3. Moles of H₂

The molar ratio is 3 mol H₂: 2 mol Al

\text{Moles of H}_{2} = \text{0.050 04 mol Al} \times \dfrac{\text{3 mol H}_{2}}{\text{2 mol Al}} = \text{0.075 06 mol Al}

4. Volume of H₂

We can use the Ideal Gas Law to calculate the volume of hydrogen.

The gas it collected over water, so the gas collected is a mixture of hydrogen and water vapour.

p_{\text{H2}} = p_{\text{tot}} - p_{\text{H2O}} = 743 - 18.7 = \text{724.3 torr}\\\text{p}_{H2} = \text{724.3 torr} \times \dfrac{\text{1 atm}}{\text{760 torr}} = \text{0.9531 atm}

T = 21 + 273.15 = 294.15 K

\begin{array}{rcl}pV & = & nRT\\\text{0.95 31 atm} \times V & = & \text{0.075 06 mol} \times 0.082 06 \text{ L}\cdot\text{atm}\cdot\text{K}^{-1}\text{mol}^{-1} \times \text{294.15 K}\\0.95 31 V & = & \text{1.812 L}\\V & = & \textbf{1.90 L}\\\end{array}\\\text{The volume of hydrogen collected is $\boxed{\textbf{1.90 L}}$}

You might be interested in
which term is used when sugar is completely dissolved in water                                                                 
GaryK [48]
The term which is used is homogeneous.
when sugar is completely dissolved in the water, the mixture or solution homogeneous, both in same phase and same uniform texture that is liquid.
There two types of mixtures are heterogeneous and homogeneous in different phases.
If sugar is not completely dissolved in water and you see the crystals of sugar in water, then the solution will be heterogeneous.
3 0
3 years ago
What will knowledge of chemistry enable you to do?
mixer [17]
Be a chemist. Lol. Lessen waste, make chemicals more efficient, cure diseases... and stuff :)
4 0
3 years ago
Determine the number of valence electrons for the following: [kr] 5s2 4d6
wlad13 [49]

Answer: B) 2 (as indicated by electron distribution shown), but taking into account the real properties of this element, 4,7,8 also occur (see below).

Explanation:

This is the electron complement/atomic number of ruthenium, which actually has the structure [Kr] 5s1 4d7

Nevertheless, Ru does not form Ru(I) compounds and few Ru(II) compounds (RuCl2, RuBr2, RuI2). It also forms Ru(III)Cl3 and a larger number of Ru(IV) compounds, e.g. RuO2, RuS2. It also forms RuO4

3 0
3 years ago
Which of these is most likely to create large areas of land subsidence?
Mumz [18]
I think it is Global warming
6 0
2 years ago
Electrons in conductors, like copper wire, are free to roam throughout the metal in the presence of the ions that have released
Scrat [10]

Answer:

  • <u><em>No, I would not consider a metal to be a plasma because plasma is just another state of matter, and the copper wire is in solid state.</em></u>

Explanation:

Metal is not a state of matter. Metals can be solid or liquid (molten) depending on their melting point and the temperature at which they are.

Plasma is a state of matter, similar to gas, but it is reached only at very high temperatures like in the Sun. The particles in plasma state are not neutral atoms or molecules but negatively charged  ions and electrons.

The copper wire is yet a solid, thus it cannot be considered a plasma.

Metals can be in plasma state only if the temperature is too high, like the temperatures in the stars. In fact, the metals in the Sun and other hotter stars are in plasma state.

5 0
3 years ago
Other questions:
  • For each of the processes, determine whether the entropy of the system is increasing or decreasing. The system is underlined.
    13·1 answer
  • What’s 73m equal to in dm
    5·1 answer
  • The theory of plate tectonics
    15·1 answer
  • How does chemical change affect the composition of matter
    14·1 answer
  • PH is a logarithmic scale used to indicate the hydrogen ion concentration, [H+], of a solution: pH=−log[H+] Due to the autoioniz
    12·1 answer
  • Calculate the pH if the [OH-] concentration is 5.9x10-1 M.
    12·1 answer
  • What is the mass, in grams, of 50.0L of N2 at STP?
    12·1 answer
  • Please help me with this
    14·1 answer
  • What is the energy of the reaction of aqueous decomposing carbonic acid?
    11·1 answer
  • If electromagnetic radiation has a frequency of 2.0×1015s−1, what is the radiation’s energy?(1 point)
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!