3 years ago

Please help 8th grade science i need #2 please!

Chemistry

2 answers:

aivan3 [116]3 years ago

6 0

#2 onshahebsisbunwubsydtebwownsddhiiw

elena-14-01-66 [18.8K]3 years ago

3 0

Im not sure what this is give a better understanding pls

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Read 2 more answers

Us<br> What is the percent of O in<br> Cr2O3?<br> (Cr = 52.00 amu, O = 16.00 amu)<br> [? ]%

Gekata [30.6K]

The percent of O in Cr₂O₃ : 31.58%

<h3>Further explanation</h3>

Given

Cr = 52.00 amu, O = 16.00 amu

Required

The percent of O

Solution

MW Cr₂O₃ = 2 x Ar Cr + 3 x Ar O

MW Cr₂O₃ = 2.52+3.16

MW Cr₂O₃ =152 amu

$\tt \%O=\dfrac{3.Ar~O}{MW~Cr_2O_3}\times 100\%\\\\\%O=\dfrac{3.16}{152}\times 100\%\\\\\%O=31.58\%$

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