Secondary V • 2yr.
How do I answer this question: how many moles of oxygen are there in 2.25 g of CO2? Thank you!
How do I answer this question: how many moles of oxygen are there in 2.25 g of CO2? Thank you!
Explanation from Alloprof
This Explanation was submitted by a member of the Alloprof team.
Thank you for your question!
First, remember that a mole contains:
$$6,023•10^{23}\:particles$$
To solve the problem, you must first convert 2.25 g of CO2 in moles. The molar mass of CO2 is 44.095 g.
$$n=\frac{m}{M}$$
$$n_{CO_2}=\frac{2,25}{44,095}$$
$$n_{CO_2}≈0,0511\:moles$$
Legend:
• n: number of moles
• m: mass of the substance
• M: molar mass of the substance
Subsequently, it must be considered that in one mole of CO2 there are two moles of O. Thus:
$$n_{O}=2•n_{CO_2}=2•0,0511\:moles≈0,102\:moles$$
Don't hesitate if you have other questions!