Q7) Calculate the number of molecules present in 280 mL of oxygen at STP.
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We will use two constants :
Molar gas volume at stp is :
1 mole = 22400 cm³
Molecules in one mole of a gas at stp :
6.023 × 10²³ molecules.
Moles of Oxygen :
280 / 22400 = 0.0125 moles.
From Avogadros constant :
0.0125 × 6.023 × 10²³ =
7.529 × 10²¹ molecules
Molar gas volume at stp is :
1 mole = 22400 cm³
Molecules in one mole of a gas at stp :
6.023 × 10²³ molecules.
Moles of Oxygen :
280 / 22400 = 0.0125 moles.
From Avogadros constant :
0.0125 × 6.023 × 10²³ =
7.529 × 10²¹ molecules
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