# chemistry

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.
a. How many moles of Cu are in the sample?
0.4831:63.546g/mol =.76 moles

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.)

mass O=0.6349- 0.431g Cu =0.1518g

c. how many moles of O are there in the sample?

1. 👍
2. 👎
3. 👁
1. If I divide 0.4831/63.54 I get something like 0.00776.

And g oxygen = mass sample-mass Cu = 0.5424-0.4831 = ??
moles oxygen = ??/32

1. 👍
2. 👎

## Similar Questions

1. ### Physical Science

Which condition must be met in order for an equation to be balanced? A. The elements in the reactants are the same as the elements in the products. B. There are fewer elements in the reactants than there are in the products. C.

2. ### math

the ratio of the number of students in class A, B and C is 3:7:8. if 10 students leave c and join b , the ratio of the number of students in b and c would be reversed. find the total number of students in classes a,b and c Can I

3. ### Chemistry

Two flasks A and B of equal capacity of volume contain SO3 and Co gas respectively under similar conditions of temperature and pressure. Then, which of the following statement is true? (1) A has twice the number of moles as that

4. ### Sets

Suppose Set B contains 69 elements and the total number elements in either Set A or Set B is 107. If the Sets A and B have 13 elements in common, how many elements are contained in set A?

1. ### chemistry

Mg3N2 +6H2O- 3Mg(OH)2 + 2NH3-- How many grams of H2O are needed to produce 150g of Mg(OH)2? I thought I had this but.....the correct answer should be 93 grams Where did I go wrong?? 1) Change 150 g Mg(OH)2 into moles by dividing

2. ### physical science

Periodic law states that when the elements are arranged according to their atomic numbers, this allows elements with similar properties to appear at regular intervals. Predict the group of elements and their number of valence

3. ### Chem

The numbers on the top of the coumns on the periodic table represent A The number of valence electrons that each of those elements in that column have. B The number of core electrons that each of those elements in that column

4. ### elmentary math for educators

Suppose B is proper subset of C. If n(c)=8, what is the maximum number of elements n B? What is the least possible number of elements B?

1. ### Ratios math

The ratio of the number of cars to the number of SUVs in a parking lot is 4:1. The ratio of the number SUVs to the number of Minivans is 4:5. (A) Find the ratio of the number of minivans in the parking lot. (B) if there are 20

2. ### CHEM HELP

what is the theoretical mole ratio- NaCl to NaHCO3 How do you determine the percentage error of an experimental mole ratio It would be easier for us to help you if we had the entire problem instead of just parts of it. However,

3. ### Chemistry

2NaOH+2Al+2H2O --> 2NaAlO2+3H2 here is the reaction. If i am trying to find the mass of hydrogen produced and i am trying to convert .95 moles Al to moles H, which number from the reaction do I use for H when converting from moles

4. ### General Chemistry

The formula of a compound of lead (Pb) and sulfur (S) was determined using the method in this module. A sample of Pb was weighed into a crucible and covered with finely powdered S. The crucible was covered and heated to allow the