Question 1
Fill in the blanks. Write your answers in standard form (NOT scientific notation)
1. From the periodic table we can see that 2.500 moles of Zinc (Zn) has a mass of
            grams.
2. If one mole of Uranium has a mass of 238.029 g, 0.0550 moles of U has a mass of
            grams.
3. We know that one mole of Oxygen gas contains two moles of O atoms (remember that O is a diatomic element in nature and is written O2). If we have a sample of O2 that contains 1.0000 X 10-²º mol, we will have          atoms of O in the sample.

Question 2
There are pennies in 1.500 moles of pennies? (for scientific notation, use the ^symbol similar to 2.02 X 10^5)

Question 3
In the lab you weigh out 76.02 g of Iron (Fe). How many moles of Iron do you have in the sample. (Your answer must have a unit please use the abbreviation for the unit).

Question 4
How many atoms of Phosphorus (P) are in 45.67 g of P? (Your answer should just be a number. Do not include atoms as the unit. For scientific notation use the "^"symbol before the exponent. For example 2.54 X 10^5)

Question 5
In the lab you are asked to measure out 24.15 mol of Aluminum (AI). How many grams of Aluminum do you have to weigh out? Write the answer in standard form
NOT scientific notation.

Question 6
If you have 35.255 g of pure H2O in a water bottle, how much of that 35.255 g is mass due to Oxygen atoms? (only put a number for your answer. since the unit is listed beside the answer spaces below)
                  grams
How many grams are due to the H atoms?
                  grams

Question 7
A. How many of each of the following atoms are in one molecule of ammonium phosphate (NH4)3PO4?
N =
H =
P =
O =
B. What is the molar mass of ammonium phosphate to 6 significant figures?
Molar mass =                g/mol

Question 9
In a 163.80 g sample of calcium carbonate (CaCO3)
a. How many moles of calcium carbonate to you have?          mol
b. How many moles of O atoms do you have?          atoms O
C. How many molecules of calcium carbonate are in the sample? (use the ^ sign for your scientific notation i.e. 10^8)
                  molecules CaCO3

Question 1 Fill in the blanks. Write your answers in standard form...