if one can find the ratio of the number of moles of the elements in a compound t
ID: 838662 • Letter: I
Question
if one can find the ratio of the number of moles of the elements in a compound to one another, one can find the formula of the compound. in certain compound of copper and oxygen, Cux Oy, we find that a sample weighing 0.5424g contains 0.4831g Cu.
Molar Mass:
Cu = 63.546g, Cl = 35.4527g, H = 1.00794g, O = 15.994, H2O = 18.0148
a. How many moles of Cu are in the sample?
b. How many grams of O are there in the sample? (the mass of the sample equals the mass of Cu plus the mass of O.)
c. how many moles of O are there in the sample?
d. What is the mole ratio (no. moles Cu/no. Moles O) in the sample?
e. What is the formula of the oxide? (The atom ratio equals the mole ratio, and is the expressed using the smallest integers possible.)
f. What is the molar mass of copper oxide?
show work please, Max points rewarded thanks!
Explanation / Answer
mass of sample = 0.5424 g
mass of Cu = 0.4831 g
a) moles of Cu = 0.4831 / 63.546 = 0.0076023
b) mass of O = 0.5424 - 0.4831 = 0.0593 g
c) moles of O = 0.0593 / 15.994 = 0.0037076
d) mole ratio(Cu/O) = 0.0076023 / 0.0037076 = 2.05046
e) Formula is Cu2O.
f) molar mass = 63.546*2 + 15.994 = 143.086 g
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