the weight of co2 formed when 3 g of carbon is completely burnt in excess of oxygen is
The weight of CO2 formed when 3 g of carbon is completely burnt in excess of oxygen
Answer:
When 3 grams of carbon is completely burnt in excess oxygen, it combines with oxygen to form carbon dioxide (CO2). The molar mass of carbon is 12 g/mol, and the molar mass of carbon dioxide (CO2) is 44 g/mol (12 g/mol for carbon + 32 g/mol for two oxygen atoms).
To calculate the weight of CO2 formed, first, we need to determine the moles of carbon in 3 grams.
Number of moles of carbon = Mass of carbon / Molar mass of carbon
Number of moles of carbon = 3 g / 12 g/mol
Number of moles of carbon = 0.25 mol
From the balanced chemical equation of the combustion of carbon:
C + O2 → CO2
We know that 1 mole of carbon combines with 1 mole of oxygen to produce 1 mole of CO2. Therefore, 0.25 moles of carbon will combine with 0.25 moles of oxygen to produce 0.25 moles of CO2.
Now, calculate the weight of CO2 formed:
Weight of CO2 = Number of moles of CO2 * Molar mass of CO2
Weight of CO2 = 0.25 mol * 44 g/mol
Weight of CO2 = 11 grams
Therefore, when 3 grams of carbon is burnt completely in excess oxygen, the weight of CO2 formed will be 11 grams.