KVPY SA Exam 2015 Question Paper

Question : 71 of 80

Marks: +1, -0

CHEMISTRY

When 262 g of xenon (atomic mass = 131) reacted completely with 152 g of fluorine (atomic mass = 19), a mixture o f XeF

_2

and XeF

_6

was produced. The molar ratio XeF

_2

: XeF

_6

Solution:

\table ,2Xe, + ,4F_2,\ {––––– ▸}\ ,XeF_2 ,+, XeF_6 ; \Initial \Mole ,2 ,,8, ,0,, 0

∴ moles of XeF

_2

formed = 0.5
moles of XeF

_6

formed = 0.5
∴ moles ratio = 1 : 1

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