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
Dahasolnce [82]
3 years ago
12

What is the mass of 22.4 L of H2 at STP?

Chemistry
2 answers:
Vanyuwa [196]3 years ago
7 0

A. 1.01 is the right answer

Since

The formula is Pv= nRT

P=1 atm

V= 22.4 L

N= x

r= 0.0821

t = 273 k (bc it’s standard temperature)

So (1)(22.4)=(x)(0.0821)(273)

X= 1.001

Elanso [62]3 years ago
6 0

Answer: Option (b) is the correct answer.

Explanation:

STP means standard temperature and pressure. At this condition pressure is 1 atm, volume is 22.4 L and temperature is 298 K.

Therefore, using ideal gas equation we will calculate the number of moles as follows.

                             PV = nRT

                        1 atm \times 22.4 L = n \times 0.0832 Latm K^{-1}mol^{-1} \times 298K

                                 n = 0.903 mol

                                    = 1 mol (approx)

Hence, it is known that molar mass of hydrogen molecule is 2 g/mol. Therefore, calculate mass of H_{2} at STP as follows.

                 Number of moles = \frac{mass}{molar mass}

                       1 mol = \frac{mass}{2.02 g/mol}

                          mass = 2.02 g

Thus, we can conclude that the mass of 22.4 L of H2 at STP is 2.02 grams.

You might be interested in
7. In which environment would liverworts and hornworts grow?
Lelechka [254]
Didjtntbbfjchfjfnt thriving tkfkdkalemrnnfnfjcjfjfjrj
5 0
3 years ago
Which statement is best supported by this scale? (LT 2)
bearhunter [10]

Answer:

The answer is C I think..

6 0
2 years ago
Read 2 more answers
PLEASE HELP ME ASAP! CHEMISTRY TUTOR<br><br> SEE ATTACHED
Masteriza [31]

Answer:

\large \boxed{\text{-827.4 kJ}}

Explanation:

We have three equations:

1. 2H₂S(g)            + O₂(g)   ⟶ 2S(s, rhombic) + 2H₂O(g) ; ∆H = -442.4 kJ

2. S(s, rhombic)  + O₂(g)   ⟶ SO₂(g);                                 ∆H = -296.8 kJ

3. PbO(s)             + H₂S(g) ⟶ PbS(s)               + SO₂(g);    ∆H =  -104.3 kJ

From these, we must devise the target equation:

4. 2PbS(s)            + 3O₂(g) ⟶2PbO(s)             + 2SO₂(g); ΔH = ?

The target equation has PbS(s) on the left, so you reverse Equation 3 and double it.

When you reverse an equation, you reverse the sign of its ΔH.

When you double an equation, you double its ΔH.

5. 2PbS(s) + 2H₂O(g) ⟶ 2PbO(s) + 2H₂S(g); ∆H = 208.6 kJ

Equation 5 has 2H₂O on the left. That is not in the target equation.

You need an equation with 2H₂O on the right, so you copy Equation 1.  

6. 2H₂S(g) + O₂(g) ⟶ 2S(s, rhombic) + 2H₂O(g) ; ∆H = -442.4 kJ  

Equation 6 has 2S(s, rhombic) on the right. That is not in the target equation.

You need an equation with 2S(s, rhombic) on the left, so you double Equation 2.  

7. 2S(s, rhombic)  + 2O₂(g) ⟶ 2SO₂(g); ∆H = -593.6 kJ

Now, you add equations 5, 6, and 7, cancelling species that appear on opposite sides of the reaction arrows.

When you add equations, you add their ΔH values.

You get the target equation 4:

5. 2PbS(s)  + <u>2H₂O(g</u>)  ⟶ 2PbO(s) + <u>2H₂S(g</u>);  ∆H =  208.6 kJ

6. <u>2H₂S(g)</u> + O₂(g)        ⟶ <u>2S(s</u>)     + <u>2H₂O(g)</u> ; ∆H = -442.4 kJ

<u>7</u><u>. </u><u>2S(s)</u><u>      + 2O₂(g)      ⟶ 2SO₂(g);                   ∆H = -593.6 kJ </u>

4 . 2PbS(s) + 3O₂(g)      ⟶ 2PbO(s) + 2SO₂(g); ΔH = -827.4 kJ

\Delta H \text{ for the reaction is $ \large \boxed{\textbf{-827.4 kJ}}$}

8 0
3 years ago
Which of the following best describes AgCl
vagabundo [1.1K]

Answer: Where are the answers?

Explanation:

7 0
3 years ago
Which of the following values are not equal to 1 mole?
Gekata [30.6K]

Answer:

none of them are equal to one mole

3 0
3 years ago
Other questions:
  • Magnesium oxide decomposes into magnesium and oxygen. if 12.09 g of magnesium oxide decomposes to form 7.29 g of magnesium, what
    14·1 answer
  • The stomach and intestines allow a person to grow and survive by helping the body
    6·1 answer
  • Describe the quantum model of an atom in terms of energy levels, sublevels, and orbitals. (Any atom is acceptable)
    8·1 answer
  • The frequency of stretching vibrations is correlated to the strength and stiffness of the bond between two atoms. This can be th
    6·2 answers
  • Why are atoms of lithium, sodium, and potassium almost never found alone in nature??
    11·1 answer
  • How do we view large areas of earth’s surface?
    15·1 answer
  • Sigh.....................................
    15·2 answers
  • State the difference that may be observed between the solids obtain by evaporating a solution of a solid to dryness or letting i
    12·1 answer
  • 1.4g of calcium oxide obtained by heating limestone was found to contain 0.4g of oxygen.another sample of 3.5g of calcium oxide
    15·1 answer
  • A scientific experiment requires that the temperature be lowered at a steady and gradual rate. The beginning temperature is 34°
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!