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stira [4]
2 years ago
11

How many moles of Helium gas are in a balloon with a volume of 6.452 L at 99.7 kPa

Chemistry
1 answer:
Taya2010 [7]2 years ago
8 0

Answer:

n = 0.26 mol.

Explanation:

Given,

Pressure, P = 99.7 kPa = 1 atm

where 101.325 kPa  = 1 atm

            P = 0.984 atm

Temperature, T = 297 K

Volume = 6.452 L

Now, using ideal gas equation

PV = n RT

0.984 x 6.452 = n x 0.08206 x 297

n = 0.26 mol.

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How many moles of CO2 could fit in a 475 mL bag a -22° C and 855 mmHg?
Sergeeva-Olga [200]

Answer:

The amount of moles of CO₂ is 0.026 moles

Explanation:

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

The equation known as the ideal gas equation explains the relationship between the four variables P (Pressure), V (Volume), T (Temperature) and n (Amount of substance). The ideal gas law is expressed mathematically as:

P*V = n*R*T

where P represents the pressure of the gas, V its volume, n the number of moles of gas (which must remain constant), R the constant of the gases and T the temperature of the gas.

In this case:

  • P= 855 mmHg
  • V= 475 mL= 0.475 L
  • n= ?
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Replacing:

855 mmHg*0.475 L=n*62.36367 \frac{mmHg*L}{mol*K} *251 °K

Solving:

n=\frac{855 mmHg*0.475 L}{62.36367 \frac{mmHg*L}{mol*K} *251 K}

n= 0.026 moles

<u><em>The amount of moles of CO₂ is 0.026 moles</em></u>

4 0
2 years ago
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The protons in an nucleus of an atom will not change unless a nuclear reaction takes place. The number of protons is equal to the atomic number of the element. For a neutral atom, the number of electrons and protons are equal. When they are unequal, then the atom occurs as an ion. It will has a net charge with it. The ion O²⁻ has a net charge of negative positive 2 because it has 2 more electrons than its protons. Since neutral oxygen has 8 protons, then O²⁻ ion has 8 protons and 10 electrons.
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