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wolverine [178]
3 years ago
11

Convert 78.9 kJ into calories Can you also explain how pls? ty

Chemistry
1 answer:
weqwewe [10]3 years ago
8 0

Answer:

18857.553

Explanation:

for an approximate result, multiply the value by 239

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At STP, 32 grams of O2 would occupy the same volume as:
ludmilkaskok [199]

At STP 32 g of O₂ would occupy by the same volume as  4 g of He

<h3>Further explanation</h3>

Complete question

At STP 32 g of O₂ would occupy by the same volume as:

  • 4.0 g of He
  • 8.0 g of CH₄
  • 64 g of H₂
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Standard Conditions

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol.

So the gas will have the same volume if the number of moles is the same

mol of 32 grams of O₂ :

\tt \dfrac{32}{32}=1

  • He

\tt mol=\dfrac{4}{4}=1

  • CH₄

\tt mol=\dfrac{8}{16}=0.5

  • H₂

\tt mol=\dfrac{64}{2}=32

  • SO₂

\tt mol=\dfrac{32}{64}=0.5

<em>So mol of 4 g He = mol of 32 g O₂</em>

4 0
3 years ago
How do van der waals forces hold molecules together?
IRINA_888 [86]

Answer:

Electrostatic Van de Waals forces act between molecules to form weak bonds. The types of Van der Waals forces, strongest to weakest, are dipole-dipole forces, dipole-induced dipole forces and the London dispersion forces. The hydrogen bond is based on a type of dipole-dipole force that is especially powerful. These forces help determine the physical characteristics of materials.

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What is the mass of Al₂O3 that will contain 10 kg of aluminium?​
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Answer:

1 mole of Al2O3 = 102 grams

1 mole of Al2 = 54 grams

102 grams of Al2O3 contains = 54 gram of Al2

10kg of Al2O3 contains = (54/102)*10000g Al2

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Eduardwww [97]

Answer:

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Explanation:

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