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svetlana [45]
2 years ago
14

The chemical formula for propane is: CH3CH2CH3 Calculate the molar mass of propane. Round your answer to 2 decimal places.

Chemistry
1 answer:
Olegator [25]2 years ago
4 0

Answer:

44.11 g/mol

Explanation:

In order to calculate the molar mass of any molecule, we need to add the molar mass of each atom that compounds it:

  • Molar Mass of C₃H₈ = (Molar Mass of C) * 3 + (Molar Mass of H)*8
  • Molar Mass of C₃H₈ = (12.01) * 3 + (1.01) * 8
  • Molar Mass of C₃H₈ = 44.11 g/mol

The molar mass of propane is thus 44.11 g/mol.

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A small cylinder of helium gas used for filling balloons has a volume of 2.20 L and a pressure of 14300 kPa at 25 ∘C. Part A How
Korvikt [17]

Answer:

You can fill 212 balloons.

Explanation:

First we <u>calculate the helium moles in the small cylinder</u>, using <em>PV=nRT:</em>

  • P =  14300 kPa ⇒ 14300 * 0.009869 = 141.13 atm
  • V = 2.20 L
  • n = ?
  • R = 0.082 atm·L·mol⁻¹·K⁻¹
  • T = 25 °C ⇒ 25 + 273.16 = 298.16 K

141.13 atm * 2.20 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 K

  • n = 12.70 mol

Then we <u>calculate the number of moles that can fit in a single balloon</u>:

  • 1.22 atm * 1.20 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 K
  • n = 0.0599 mol

Finally we <u>divide the total number of available moles by the number of moles in a single balloon</u>:

  • 12.70 mol / 0.0599 mol = 212.09

So the answer is that you can fill 212 balloons.

7 0
2 years ago
two atoms have the same number of protons but different number of neutrons. what can you conclude about these masses
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Answer:

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Explanation:

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