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(Solved): What is the empirical formula for a compound that is composed of 40.27% potassium, 26.78% chromium, ...



What is the empirical formula for a compound that is composed of 40.27% potassium, 26.78% chromium, and 32.96% oxygen by mass?

Question 1 options:

 

 

K1Cr2O2

 

 

 

K1.03Cr.515O2.06

 

 

 

K1Cr.5O2

 

 

 

K2Cr1O4

 

Question 2 (3 points)

 

What is the empirical formula for a compound that contain 1.011 g of chromium and 0.467 g of oxygen. ?

Question 2 options:

 

 

Cr2O3

 

 

 

Cr0194O.029

 

 

 

Cr1O1.5

 

 

 

Cr2O4

 

Question 3 (2 points)

 

A sample of a compound is found to contain 1.011 g of chromium and 0.467 g of oxygen.

What is the percent by mass of chromium in this compound?

Question 3 options:

 

 

21.6%

 

 

 

68.4%

 

 

 

43.2%

 

 

 

65%

 

Question 4 (2 points)

 

In Experiment 3 how do you find mass of reacted Iodine?  

Question 4 options:

 

 

Mass of stoppered test tube containing Zinc iodide -Mass of empty  test tube

 

 

 

Mass of filter paper containing iodine -Mass of empty filter paper

 

 

 

Mass of stoppered test tube containing iodine -Mass of empty stoppered test tube

 

 

 

Mass of Beaker containing iodine -Mass of empty beaker paper

 



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