Author Question: How many moles are there in 2.00 kg of copper? The atomic weight of copper is 63.5 g/mol and its ... (Read 267 times)

kaid0807 · **on:** Jul 29, 2018

How many moles are there in 2.00 kg of copper? The atomic weight of copper is 63.5 g/mol and its density is 8.90 g/cm3.

A) 31.5 B) 15.3 C) 53.1 D) 51.3

Question 2

A pion is an unstable particle that has a mean lifetime of 2.55 10-8 s.

This is the time interval between its creation in a nuclear process and its extinction into decay products, as measured in a frame of reference at rest with respect to the pion. An average pion is traveling at 0.230c relative to Earth. How far does it travel in its lifetime, relative to Earth?
A) 2.23 m B) 3.50 m C) 2.07 m D) 1.81 m E) 3.22 m