how many moles of copper atoms are in a penny that contains 0.078 grams of copper? refer to a periodic…

how many moles of copper atoms are in a penny that contains 0.078 grams of copper? refer to a periodic table. write your answer to the correct number of significant figures. round if necessary. moles

how many moles of copper atoms are in a penny that contains 0.078 grams of copper? refer to a periodic table. write your answer to the correct number of significant figures. round if necessary. moles

Answer

Explanation:

Step1: Identify molar - mass of copper

From the periodic table, the molar - mass of copper (Cu) is approximately 63.55 g/mol.

Step2: Use the mole 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. Given $m = 0.078$ g and $M=63.55$ g/mol, then $n=\frac{0.078}{63.55}\approx0.00123$ mol.

Answer:

$0.0012$ mol (rounded to 2 significant figures)