Question

Xg of U and 3.795 g of O combine to form 20.00 g of
U308 . What is the percent composition of uranium in U308 ?
a
15.18%
b 42.41%
C 81.03%
d None of the above

Answer 1

The percent composition of Uranium in U308 = C. 81.03%

Further explanation

Given

X g of U

3.795 g of O

20.00 g of  U308

Required

The percent composition of Uranium

Solution

mass of Uranium in U308 :

= mass of U308 - mass of O

= 20 g - 3.795 g

= 16.205 g

The percent composition :

$\tt \%U=\dfrac{mass~U}{mass~U308}\times 100\%$

%U = (mass U/mass U308) x 100%

%U= (16.205/20) x 100%

%U = 81.025≈81.03