Determination of a Chemical Formula Page: 27. No part of any book may be reprodu

Question

Determination of a Chemical Formula Page: 27. No part of any book may be reproduced or prior permission. Use (other than qualified fair use) in violation of the law or Terms of Service is prohibited. violators will be Name Section Advance Study Assignment: Determination of a Chemical Formula To find the maw of a mole of an element. one looks up the atomic mass of the element in a table of atomic masses (see Appendix III or the Periodic Table) The molar mass of an element is simply the mass in grams of that element that is numerically equal to it atomic mass For a compound substance. the molar mass is equal to the mass in prams that is numerically equal to the sum of the atomic masses in the formula of the substance Find the molar mass of 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 a certain compound of copper and oxygen. Cu2O3, we find that a sample weighing 0.6349 g contains 0.5639 g Cu. How many moles of Cu are there in the sample? (No. moles = mass Cu/molar mass Cu) moles 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.) g How many moles of O arc there in the sample? moles What is the mole ratio (no moles Cu/no, moles O) in the sample?

Explanation / Answer

for cu mass= 63.52g

for cl mass = 35.45g

for H mass = 1g

for O mass = 16g

for H2O = 18g

2) no. of moles cu = 0.0088

mass of O = 0.071g

mole of O = 0.0044

ratio = 2

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