How many moles of nitrogen, n, are in 65.0 g of nitrous oxide, n2o?

65 g of nitrous oxide contain 2.96 moles of nitrogen.

Explanation:

Given data:

mass of N₂O = 65 g

moles of nitrogen = ?

Solution:

First of all we will calculate the moles of N₂O.

number of moles = mass / molar mass

number of moles = 65 g/ 44.01 g/mol

number of moles = 1.48 mol

One mole of nitrous oxide contain two mole of nitrogen.

we will multiply the moles of nitrous oxide with two.

1.48 mol × 2 = 2.96 moles

So 65 g of nitrous oxide contain 2.96 moles of nitrogen.

you didnt put any of the following

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol