Question

How many moles are there in 140grams of nitrogen

Answer 1

Answer:

Given mass = 140g

Atomic mass of Nitrogen = 28

$\sf{number \: of \: moles \: = \dfrac{given \: mass}{atomic \: mass} }$

or, n = 140/28

or, n. = 5

Therefore, number of moles is 5.

More equation for finding number of moles

$\sf{n = \dfrac{molecular \: mass}{atomic \: mass}}$

$\sf{n = \dfrac{given \: volume}{22.4} }$

$\sf{n = \dfrac{no \: of \: particles}{6.022 \times {10}^{23} } }$