Learning Goal: To understand what an empirical formula is and to learn the proce

Question

Learning Goal:

To understand what an empirical formula is and to learn the procedure for finding empirical formulas.

An empirical formula expresses the simplest ratio of the elements involved. The compound P4O10has a P:O ratio of 4:10. However, this ratio can be simplified to 2:5. Therefore the empirical formula for P4O10 is P2O5.

Another example is hydrogen peroxide, which has the formula H2O2 and an empirical formula of HO.

One way that chemists analyze new or unknown compounds is to determine the percentage composition of elements experimentally, which yields the empirical formula.

Part A

What is the empirical formula for the compound P4O6?

Express your answer as a chemical formula.

Information for Parts B, C, and D

A compound is 80.0% carbon and 20.0% hydrogen by mass. Assume a 100.-g sample of this compound.

Part B

How many grams of each element are in this sample?

Enter the number of grams of carbon followed by the number of grams of hydrogen, separated by a comma (e.g., 30.0,70.0).

Explanation / Answer

Compound is P4O6

divide by the smallest integer which divies 4 as well as 6

which gives P2O3

b) Basis : 100 gm of sample. It contains 80% Carbon , that is 80 grams of Carbon and 20% hydrogen

that is 20 grms of hydrogen which can be written as (80.20).

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