Question

balance chemical equation given below and calculate the number of molecules of SO2 gas when libearted on consuming of 3 mol of oxygen gas at STP :Cu2S+O2=Cu2O+SO2​

Answer 1

The Balanced equation is:

$2Cu_{2}S+3O_{2} = 2Cu_{2}O +2SO_{2}$

• If 3 moles of oxygen is consumed, then 2 moles of SO2 is liberated.
• one mole of a gas consists of Avagadro number of molecules or atoms.

• Avagadro number = $6.022*10^{23}$.
• Therefore the number of SO2 molecules liberated are $12.044*10^{23}$ molecules.

Answer 2

Answer:

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