substance #2\nmagnesium ribbon\nmass = 0.78 g mg\nhow many moles are in the magnesium ribbon?
substance #2\nmagnesium ribbon\nmass = 0.78 g mg\nhow many moles are in the magnesium ribbon?
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 magnesium ($Mg$) is $M = 24.31\ g/mol$.
Step2: Substitute values
We are given $m = 0.78\ g$ and $M=24.31\ g/mol$. Substitute these values into the formula: $n=\frac{0.78\ g}{24.31\ g/mol}$.
Step3: Calculate the number of moles
$n=\frac{0.78}{24.31}\ mol\approx0.032\ mol$.
Answer:
$0.032\ mol$