1. You have 22.1 moles of nitric acid (HNO3). How many oxygen atoms do you have?

Question

1. You have 22.1 moles of nitric acid (HNO3). How many oxygen atoms do you have?

2. The reaction shown below shows that silver nitrate reacts with sodium chloride to make silver chloride and sodium nitrate. How many grams of silver chloride will be produced from 100 g of silver nitrate when it is mixed with 100,000,000 grams of sodium chloride?

AgNO3 + NaCl ? AgCl + NaNO3

3.How many moles of NaOH are in 25.0 mL of 0.212M NaOH? There are 1,000 ml per liter.

4. 25.0 mL of 0.212 M NaOH is neutralized by 13.6 mL of an HCl solution. The molarity of the HCl solution is...

The relevant balanced reaction is shown here:

NaOH + HCl => NaCl + H2O

5. There are approximately 28.3 grams per ounce. According to the United States Food & Drug Administration, the recommended daily requirement of protein is 44g for adult women. How many ounces of protein is this?

6. Alanine is an amino acid with the following molecular formula: C3H7NO2. You are going to attach 10 alanine molecules to each other by peptide bonds. What is the molecular formula for the molecule that is made by attaching 10 alanine amino acids together in this way?

6.  

Diamonds have a density of 3.52 g/mL. What is the volume of a diamond with a mass of 15.1 g?

Answer

4.29 cm3

0.233 cm3

63 cm3

4.9 cm3

53 cm3

7. A serving of fish contains 50g protein and 4 g of fat. If protein has a caloric value of 4 KCal / g and fat has 9 KCal / g, how many KCal are in the serving? KCal = kilocalories.

4.29 cm3

0.233 cm3

63 cm3

4.9 cm3

53 cm3

7. A serving of fish contains 50g protein and 4 g of fat. If protein has a caloric value of 4 KCal / g and fat has 9 KCal / g, how many KCal are in the serving? KCal = kilocalories.

Explanation / Answer

1) 1 mole HNO3 contains 3 moles Oxygen atom

moles of HNO3 = 22.1/63 = .351 moles

moles of O = 3*0.351 = 1.053

atoms of O = 1.053*6.023*10^23atoms = 6.34*10^23atoms

2)Silver nitrate is the limiting reagent

moles of AgNO3 = 100/169.87 = .589 moles

thus moles of silver chloride formed = 0.589moles

weight = .589*143.32 = 84.4155g

3) moles = .212*25*10^-3 = 5.3*10^-3moles

4) moles of NaOH = moles of HCl

25*.212 = 13.6 * M

M = .39M

5)44/28.3 = 1.555ounce

6) d = 3.52g/cc

d = m/V

V = 15.1/3.52 = 4.29cm3

7) KCal = (4*50)+(4*9) = 236KCal

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