lakshmi has a sample of ammonium nitrate (nh₄no₃) that has a mass of 40.10 g. she knows that the molar mass…

lakshmi has a sample of ammonium nitrate (nh₄no₃) that has a mass of 40.10 g. she knows that the molar mass of nh₄no₃ is 80.0432 g/mol. to the correct number of significant digits, how many moles of nh₄no₃ does the sample contain?\n0.50 moles\n0.500979 moles\n0.500980 moles\n0.5010 moles

lakshmi has a sample of ammonium nitrate (nh₄no₃) that has a mass of 40.10 g. she knows that the molar mass of nh₄no₃ is 80.0432 g/mol. to the correct number of significant digits, how many moles of nh₄no₃ does the sample contain?\n0.50 moles\n0.500979 moles\n0.500980 moles\n0.5010 moles

Answer

Explanation:

Step1: Recall mole - mass formula

The formula to calculate the number of moles ($n$) is $n=\frac{m}{M}$, where $m$ is the mass of the substance and $M$ is the molar mass.

Step2: Substitute given values

Given $m = 40.10\ g$ and $M=80.0432\ g/mol$. So, $n=\frac{40.10}{80.0432}$.

Step3: Calculate the number of moles

$n=\frac{40.10}{80.0432}\approx0.5010\ mol$. We round to four - significant digits because the mass ($40.10\ g$) has four significant digits.

Answer:

0.5010 moles