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schepotkina [342]
2 years ago
10

Question 1 how many moles of helium are found in a balloon that contains 5.5 l of helium at a pressure of 1.15 atm and a tempera

ture of 22.0 ºc?
Chemistry
2 answers:
DaniilM [7]2 years ago
7 0

Answer : The number of moles of helium gas found in a balloon are 0.26 moles.

Explanation :

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

PV = nRT

where,

P = Pressure of helium gas = 1.15 atm

V = Volume of the helium gas = 5.5 L

n = number of moles of helium gas = ?

R = Gas constant = 0.0821\text{ L.atm }mol^{-1}K^{-1}

T = Temperature of helium gas = 22.0^oC=273+22.0=295K

Putting values in above equation, we get:

1.15atm\times 5.5L=n\times 0.0821\text{ L.atm }mol^{-1}K^{-1}\times 295K\\\\n=0.26mol

Therefore, the number of moles of helium gas found in a balloon are 0.26 moles.

denpristay [2]2 years ago
3 0
Using pv=nRT
T= 22+273 K
P=1.15 Pa
R=8.31
V =5.5... (u did not write the unit so...)

Therefore n,mole= (1.15×5.5) ÷ (273+22)(8.31)
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Vinil7 [7]

Answer:

Correct, because B it is reported to the nearest miligram

Explanation:

4.6 rounded up is 5

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2 years ago
Which of the following shows a Bronsted-Lowry acid reacting?
7nadin3 [17]
<h3>Answer:</h3>

         Option-C:  HCl + H₂O  →   H₃O⁺ + Cl⁻

Explanation:

       Bronsted-Lowery concept of Acid and Base defines Acid as that specie which tends to donate H⁺ (Hydrogen Ion) and bases are those species which accepts H⁺ from Acids.

In selected option, HCl is reacting as Acid as it donates H⁺ to water (lowery bronsted base).

Also, the correspong acid is converted into conjugate base (i.e. Cl⁻) and base is converted into conjugate acid (i.e. H₃O⁺)

8 0
2 years ago
Read 2 more answers
The electron in a ground-state H atom absorbs a photon of wavelength 97.20 nm. To what energy level does it move?
Lunna [17]

Answer:

E = h v = 6.626 x 10^{-34} x 97.20 x 10^{-9} = 6.44 x 10^{-41} J = 4.01 x 10^{-22} eV

n = Energy Level = -E^{0} / E = -13.6 / 4.01 x 10^{-22} = 3.39 x 10^{22} = 1.84 x 10^{11} energy level...

7 0
2 years ago
Find the molarity of 186.55 g of sugar (C12H22O11) in 250. mL of water.
Anna [14]

Answer:

The molarity of this sugar solution in water is 2.18 M

Explanation:

Step 1: Data given

Mass of sugar (C12H22O11) = 186.55 grams

Molar mass of C12H22O11 = 342.3 g/mol

Volume of water = 250.0 mL = 0.250 L

Step 2: Calculate moles sugar

Moles sugar = mass sugar / molar mass sugar

Moles sugar = 186.55 grams / 342.3 g/mol

Moles sugar = 0.545 moles

Step 3: Calculate molarity of the sugar solution

Molarity = moles sugar / volume of water

Molarity = 0.545 moles / 0.250 L

Molarity = 2.18 MThe molarity of this sugar solution in water is 2.18 M

6 0
2 years ago
A certain radioactive nuclide has a half life of 1.00 hour(s). Calculate the rate constant for this nuclide. s-1 Calculate the d
Karo-lina-s [1.5K]

Answer:

k= 1.925×10^-4 s^-1

1.2 ×10^20 atoms/s

Explanation:

From the information provided;

t1/2=Half life= 1.00 hour or 3600 seconds

Then;

t1/2= 0.693/k

Where k= rate constant

k= 0.693/t1/2 = 0.693/3600

k= 1.925×10^-4 s^-1

Since 1 mole of the nuclide contains 6.02×10^23 atoms

Rate of decay= rate constant × number of atoms

Rate of decay = 1.925×10^-4 s^-1 ×6.02×10^23 atoms

Rate of decay= 1.2 ×10^20 atoms/s

8 0
2 years ago
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