CHEM 100 San Diego State University Molecules and Atoms Chemical Analysis Quiz

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Please help me with the below questions.

QUESTION 1

1. Imagine you have 20 g of water (H₂O) in a beaker. Does your beaker contain more than, less than, or exactly one mole of water molecules?

   Exactly one mole

   More than one mole

   Less than one mole

   Impossible to tell

QUESTION 2

1. How many moles of nitrogen atoms are present in 12 g of (NH₄)₂CO₃? Place your answer in the box below as a number only (no units).
   

   
   

5 points

QUESTION 3

1. Which of the following contains the greatest number of Na⁺ ions?

   		25.0 g Na2SO3
   		25.0 g Na2SO4
   		25.0 g Na3PO4
   		25.0 g NaNO3
   		25.0 g Na3PO3

5 points

QUESTION 4

1. One serving of cake contains 10.0 mg of cholesterol, which is 25.9 x 10^-6 mol of cholesterol. What is the molar mass in grams of cholesterol? Place your answer in the box below as a number only (no units).
   

   
   

5 points

QUESTION 5

1. A typical bag of peanut M&M’s candy contains 32 pieces. How many moles of M&M’s is this?

   
   

5 points

QUESTION 6

1. The world’s population is approximately 7,800,000,000. Suppose you had a mole of U.S. dollars to distribute equally among all the people on Earth. How many dollars would each person receive?

   
   

5 points

QUESTION 7

1. By chemical analysis, the composition of a hydrocarbon was found to be 79.85% carbon and 20.15% hydrogen. Which of the following is its correct empirical formula?

   C4H

   C6H

   C2H4

   C4H2

   CH6

   C3H6

   C3H

   CH4

   CH3

5 points

QUESTION 8

1. If the empirical formula of a compound is C₂H₄O and 1 mol of the compound has a mass of 88 g, which of the following is its molecular formula?

   C5H12O

   C10H20O5

   C6H12O3

   C8H16O4

   C4H8O2

5 points

QUESTION 9

1. By chemical analysis, the composition of a compound was found to be 39.99% carbon, 6.73% hydrogen, and 53.28% oxygen. Determine its empirical formula.Enter your answer by putting the correct subscript in the box following each atom. Do not leave any boxes blank, include the number 1 if necessary.Empirical Formula: CHO
   If the mass of 0.6 moles of the compound is 90 g, what is its molecular formula?Enter your answer by putting the correct subscript in the box following each atom. Do not leave any boxes blank, include the number 1 if necessary.Molecular Formula: CHO
   

6 points

QUESTION 10

1. How many moles of H₂O would be produced if 1.5 moles of C₅H₁₂ were to react completely with excess O₂ by the reaction:C₅H₁₂ + O₂ —> CO₂ + H₂O?(Hint: You will first need to balance the chemical reaction.)
   

   
   

5 points

QUESTION 11

1. According to the following balanced chemical reaction:
   3CaCl₂ + 2Na₃PO₄ –> Ca₃(PO₄)₂ + 6NaCl
   how many grams of NaCl will be produced if 0.721 g of CaCl₂ are allowed to completely react with excess Na₃PO₄? Enter your answer to three significant figures without units.

   
   

8 points

QUESTION 12

1. Which of the following compounds contains carbon in its most reduced form? (HINT: start by determining the oxidation numbers for each of the atoms in the compounds.)

   CH4

   C2H6

   CH3F

   C6H12O6

   CO2

5 points

QUESTION 13

1. What is the oxidation number for the Mn atom in the polyatomic anion permanganate (MnO₄^–)?

   
   

5 points

QUESTION 14

1. Consider the following unbalanced reaction:CH₃OH + Cl₂ + H₂ –> CH₃Cl + H₂OBalance the reaction by entering the appropriate coefficients in front of each molecule. Do not leave any boxes blank, enter 1 if necessary. Next, determine if any atom is being oxidized during the reaction. Enter the symbol for the atom into the box below. If no atom is reduced, enter NA.Atom oxidized: