q.15.how many moles of mg are there in 2.75g of mg? (7 p\nshow your work for full credit.report your answer…
q.15.how many moles of mg are there in 2.75g of mg? (7 p\nshow your work for full credit.report your answer to correct number of significant figures and units.\nans. given: 2.75g\nfind: moles of mg\nconceptual plan:\n2.75g × 1 mol / 24.30g=\nsolve:\n\na sample of copper wire has a mass of 32.5g. if the atomic mass of copper is 63.5g/mol, how many moles of copper are there.\nreport your answer to correct number of significant figures and with units.\ngiven: 32.5g
Answer
Explanation:
Step1: Recall molar - mass formula
The formula to calculate the number of moles $n$ is $n=\frac{m}{M}$, where $m$ is the mass and $M$ is the molar mass. The molar mass of Mg is approximately $24.31\ g/mol$.
Step2: Substitute values
We are given $m = 2.75\ g$ and $M=24.31\ g/mol$. Substitute these values into the formula: $n=\frac{2.75\ g}{24.31\ g/mol}$.
Step3: Calculate the result
$n=\frac{2.75}{24.31}\ mol\approx0.113\ mol$ (rounded to three significant figures).
Answer:
$0.113\ mol$