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:
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K1Cr2O2
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K1.03Cr.515O2.06
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K1Cr.5O2
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K2Cr1O4
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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:
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Cr2O3
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Cr0194O.029
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Cr1O1.5
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Cr2O4
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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:
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21.6%
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68.4%
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43.2%
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65%
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Question 4 (2 points)
In Experiment 3 how do you find mass of reacted Iodine?
Question 4 options:
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Mass of stoppered test tube containing Zinc iodide -Mass of empty test tube
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Mass of filter paper containing iodine -Mass of empty filter paper
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Mass of stoppered test tube containing iodine -Mass of empty stoppered test tube
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Mass of Beaker containing iodine -Mass of empty beaker paper
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