I really don't get this one problem can anyone help?
Plz xplain ty for your help
2007-12-02 12:52:13 · 5 answers · asked by MiCk 2 in Science & Mathematics ➔ Chemistry
Calculate the molecular mass of potassium (this is its atomic mass on the periodic table) Calculate the molecular mass of hydroxide (atomic mass of oxygen + atomic mass of hydrogen on the periodic table). Add the 2 to get the molecular mass of potassium hydroxide. % composition of the potassium is the mass of the potassium divided by the mass of the potassium hydroxide.
2007-12-02 12:57:46 · answer #1 · answered by Allison 2 · 0⤊ 0⤋
mol. mass KOH = 39 + 16 + 1 = 56 g/mole
% K = 39 / 56 X 100 = 69.64%
% O = 16 / 56 X 100 = 28.57%
% H = 1 /56 X 100 = 1.79%
2007-12-02 20:59:20 · answer #2 · answered by Dennis M 6 · 1⤊ 0⤋
first of all if it is one mole of KOH than add the masses of K O and H to get a total mass than divide each by the total and than you either divide 100 or multiply by 100 to get percent it should be a decimal.
2007-12-02 20:58:41 · answer #3 · answered by xochitlbear 2 · 0⤊ 0⤋
You take the molar masses of each element and divide them by the molar mass of the entire compound.
Ex: MM of K/MM of KOH.
2007-12-02 20:58:25 · answer #4 · answered by Cayla 1 · 0⤊ 0⤋
Pay attention to Dennis M. He knows whereof he speaks.
2007-12-02 21:07:11 · answer #5 · answered by steve_geo1 7 · 0⤊ 0⤋