percent compositions?

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Stéphanie

New member
1. A sample of iron oxide is determined to be 28 grams of iron and 12 grams of oxygen.

What is the percent of iron in the compound? (Points: 10)
30 percent
50 percent
70 percent
90 percent


2. A sample of iron oxide is determined to be 28 grams of iron and 12 grams of oxygen.
What is the percent of oxygen in the compound? (Points: 10)
30 percent
50 percent
70 percent
90 percent


3. What is the percent of iron in Ferric oxide? (Ferric oxide is iron III oxide). (Points: 10)
30 percent
50 percent
70 percent
90 percent


4. A sample of a sodium and oxygen compound contains 53 grams of sodium and 37 grams of oxygen.
What is the percent of sodium in this compound? (Points: 10)
41 percent
59 percent
68 percent
72 percent


5. A sample of a sodium and oxygen compound contains 53 grams of sodium and 37 grams of oxygen.


What is the percent of oxygen in this compound? (Points: 10)
41 percent
59 percent
68 percent
72 percent


6. What is the percent sodium in sodium peroxide (Na202)? (Points: 10)
41 percent
59 percent
68 percent
72 percent


7. What is the mass of 1. Mole of diatomic nitrogen gas? (Points: 10)
14 g
28 g
17 g
32 g


8. What is the mass of 1 mole of ammonia? (Points: 10)
14 g
28 g
17 g
32 g


9. What is the mass of 1 mole of hydrogen nitrate (also called nitric acid)? (Points: 10)
45 g
58 g.
63 g
82 g


10. What is the mass of 7.5moles of iron Fe? (Points: 10)
32
220
335
419
 
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