A newly discovered element, Y, has two naturally occurring isotopes. 90.3 percent of the sample is an isotope with a mass of 267.8 u, and 9.7 percent of the sample is an isotope with a mass of 270.9 u. What is the weighted average atomic mass for this element?

269.4 u

268.1 u

269.0 u

270.6 u

Question

A newly discovered element, Y, has two naturally occurring isotopes. 90.3 percent of the sample is an isotope with a mass of 267.8 u, and 9.7 percent of the sample is an isotope with a mass of 270.9 u. What is the weighted average atomic mass for this element?
 
269.4 u
 
268.1 u
 
269.0 u
 
270.6 u

superhelp101 · Answer

@Abhisar can u help?

abhisar · Answer

Hello @superhelp101 !

abhisar · Answer

U have any idea to do this ?

superhelp101 · Answer

umm would be something like this (.903)(267.8)+(.97)(270.9)

abhisar · Answer

yes u r going the ryt way !

superhelp101 · Answer

what do i do after I solve that

abhisar · Answer

There is one mistake in ur above line
it will be 0.097 and not .97

abhisar · Answer

getting it ?

abhisar · Answer

after solving u will get the answer

superhelp101 · Answer

oh ok. I just solved it is it 268.1

abhisar · Answer

yep..u need to divide each % by 100 :)

superhelp101 · Answer

hehehe thanks!

abhisar · Answer

$\color{red}{\huge\bigstar}\huge\text{You're Most Welcome!  }\color{red}\bigstar$
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