How many grams are there in 5.00 moles of hydrogen dioxide?
Solved
In order to solve the question, it is necessary to be able to write the “hydrogen dioxide” formula.
The hydrogen dioxide formula is H2O.
Molecular mass of H2O = 2.H + O = 2.1+16=18 gr/mol
1 moles H2O 18 gr/mole
5 moles H2O x
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x=90 grams H2O
Suppose the elements X and Y combine to from two compounds X2Y and X2Y3. When 0,1 mole of X2Y weights 4,4 g and 0,05 mole of X2Y3 weights 3,8 g, the atomic weights of X and Y are?
Solved;
In order to solve the problem, the mass of 1 moles must be found.
0,1 mole X2Y 4,4 grams
1mole X2Y a
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a= 44 grams X2Y
0,05 mole X2Y3 3,8 grams
1 mole X2Y3 z grams
______________________
z= 76 grams X2Y3
2X+Y=44
2X+3Y= 76
-*(2X+Y=44)
2X+3Y= 76
___________
2Y=32
Y=16
If we write the Y value we found into one of the equations, we find the value X
2X+Y=44 ——> 2X+16= 44 —–> 2X=28——> X=14
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