Question

copper is used in many engineering applications, particularly in electrical engineering (wiring and connectors), construction (roofing and plumbing) and in machinery and other components. the average atomic weight for copper is 63.546 g/mol and the density of copper is 8.96 g/cm³. how many moles of copper are there in a 1 cm³ of copper? 0.0141 moles 0.0541 moles 0.141 moles dont test me yet, i am trying to gain an understanding before attempting to answer this question.

Explanation:

Step1: Calculate mass of 1 cm³ copper

Use density formula $m =
ho V$. Given $
ho = 8.96\ g/cm^{3}$ and $V = 1\ cm^{3}$, so $m=
ho V=8.96\ g/cm^{3}\times1\ cm^{3}=8.96\ g$.

Step2: Calculate moles of copper

Use formula $n=\frac{m}{M}$, where $m$ is mass and $M$ is molar - mass. Given $m = 8.96\ g$ and $M = 63.546\ g/mol$. Then $n=\frac{8.96\ g}{63.546\ g/mol}\approx0.141\ mol$.

Answer:

0.141 moles