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Marrrta [24]
2 years ago
11

How many molecules of N2O5 are there in 175 grams of N2O5?

Chemistry
1 answer:
Vaselesa [24]2 years ago
6 0

Answer:

9.76 x 10²³molecules

Explanation:

Given parameters:

Mass of N₂O₅  = 175gram

Unknown:

Number of molecules  = ?

Solution:

To find the number of molecules contained in the given mass, we need to find the number of moles of N₂O₅ first.

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

 Molar mass of N₂O₅ = 2(14) + 5(16) = 108g/mol

  Number of moles = \frac{175}{108}   = 1.62moles

  Now;

               1 mole of a substance  = 6.02 x 10²³ molecules

              1.62 mole of N₂O₅  = 1.62 x 6.02 x 10²³  = 9.76 x 10²³molecules

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Vsevolod [243]

Answer:

Bonds are broken and new bonds are formed during chemical reactions only.

Explanation:

  • A physical change in a substance doesn't change what the substance is.
  • In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
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So, the right choice is:

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3 years ago
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Answer:

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According Dalton's law of partial pressure:

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0.94 atm=0.0313 atm+p_{H_2}

p_{H_2}=0.94 atm - 0.0313 atm =0.9087 atm \approx 0.91 atm

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