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
|