You are given a sample containing 0.90 moles of a substance.?

a) How many atoms are in the sample if the substance is copper?

b) How many atoms are in the sample if the substance is silver?

c) How many molecules are present in the sample if the substance is benzene, C6H6?

Question

You are given a sample containing 0.90 moles of a substance.?

a) How many atoms are in the sample if the substance is copper? 

b) How many atoms are in the sample if the substance is silver? 

c) How many molecules are present in the sample if the substance is benzene, C6H6?

anonymous · Answer

anyone?

aaronq · Answer

$n=\dfrac{N}{N_A}$

n=moles, N=particles, $N_A$=avogadros number

anonymous · Answer

for number 1 = .90 = 63.546/6.02x10^23?

anonymous · Answer

And thanks for helping me earlier!

aaronq · Answer

no, you're solving for N

 .90 = N/6.02x10^23?

anonymous · Answer

so 1.495x10^24 is the answer?

aaronq · Answer

no, that can't be right. you multiplied by a number less than 1 and got a greater value.

anonymous · Answer

6.69x10^23?? This right?

aaronq · Answer

not likely you're still getting more than what you started with

aaronq · Answer

548002000000000000000000 = 5.48*10^23 should b your answer

anonymous · Answer

hmm, might be my calculator...

aaronq · Answer

most likely. you should use an online calculator if it's giving you problems i like this one http://web2.0calc.com or wolfram alpha