Question

The percent composition of all elements in HClO3 is:
a. 2% H, 20% Cl, 78% O
b. 1% H, 42% Cl, 57% O
c. 2% H, 68% Cl, 30% O
d. None of the above

Answer 1

well take molar mass of HClO3 and atomic masses of atoms in compound and divide each atomic mass with molar mass of compound

Answer 2

idk how to do that, im completelylost because it has different elements ombined.

Answer 3

H - 1,008
Cl - 35,45
O - 15,999
M(HClO3) = (3* 15,999) + 1,008 + 35,45 = 84,455
x(H) = 1,008/84,455 =0,0119 = 1,2 %
x(Cl) = 35,45/ 84,455= 0,419 = 42%
x(O)= 3*15,999 / 84,455=0,5683 = 57 %

Answer 4

so answer is:
b. 1% H, 42% Cl, 57% O

Answer 5

thank you so muchchemistry is so confusing. im still in the beginning of this section with mole calculations and i still dont understand it.

Answer 6

read it few times so it settles down in your head, after you learn basics chemistry is pretty easy... :)