Project #1041 - Chemistry questions

 

A teacher is giving each student 0.200 moles of copper (II) nitrate. How many formula units of this ionic substance is each student receiving?

A
B
C
D

13) Let's find the percent composition of calcium in calcium hydroxide, Ca(OH)2.

First, find the molar mass of calcium hydroxide.

______________ g/mol

 

Next, find the mass of the calcium that is part of the calcium hydroxide.

_______________ g

 

Now, find the percentage of the calcium in the calcium hydroxide. 

mathml equation

______________ %

 

Use the numbers from the periodic table and round your answers to three significant digits.

 

14) Let's find the percent composition of sodium in sodium phosphate, Na3PO4 .

First, find the molar mass of sodium phosphate.

______________ g/mol

 

Next, find the mass of the sodium that is part of the sodium phosphate.

_______________ g

 

Now, find the percentage of the sodium in the sodium phosphate. 

___________________ %

 

Use the numbers from the periodic table and round your answers to three significant digits.

 

15Determine the empirical formula of a compound containing 63.50% silver and 8.25% nitrogen and the rest oxygen.

First, find the percentage of oxygen in the compound.
Hint: add the silver and nitrogen, then subtract from 100.

________________%

 

Change the % to grams by assuming a 100g sample. So, 63.50% silver becomes 63.50g silver.

 

Next, find the moles of each element:

__________ moles Ag

___________moles N

___________moles O

 

Change to a lowest whole number ratio by dividing each mole value by the smallest number of moles.

___________Ag

___________N

___________ O

 

Finally, put these values together into an empirical formula

_______________

Note: Do not adjust font for subscripts.  Just enter H2O instead of  H2O.

 

16A compound is found to contain 63 % manganese, Mn, and 37 % oxygen.

How many moles of manganese?

______________mol Mn

 

How many moles of oxygen?

______________mol O

 

What is the compound’s empirical formula?

_______________________

 

 

 
 

Subject Science
Due By (Pacific Time) Thursday 10-25-12 1 p.m.
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