Question

How many moles of O2 are needed to react with 2.55 mol of C2H2?

Express your answer to three significant figures

Answer 1

Answer: 6.38 moles of
`O_2` are needed to react with 2.55 mol of
`C_2H_2`

Step-by-step explanation:

The balanced chemical reaction for the combustion of ethyne is:

`2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O`

According to stoichiometry:

2 moles of
`C_2H_2` require = 5 moles of
`O_2`

Thus 2.55 mol of
`C_2H_2` require =
`(5)/(2)* 2.55=6.38` moles of
`O_2`

Thus 6.38 moles of
`O_2` are needed to react with 2.55 mol of
`C_2H_2`