G11 Chemistry - Class 9 Review | Baamboozle - Baamboozle

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Mass of 0.82 mol of a diatomic molecule is 131.3 g Identify the molecule

I2

Br2

F2

O2

Indigo (C16H10N2O2) is the common name of the dye that gives blue jeans their characteristic colour. Calculate the mass of oxygen in 25.0 g of indigo.

3.05 g

Round 15: Tartaric acid, also known as Cream of Tartar, is used in baking. Its empirical formula is C2H3O3. If 1.00mol of tartaric acid contains 3.61x1024 oxygen atoms, what is the molecular formula of tartaric acid?

C4H6O6

What is the mass percentage of carbon in C10H14O?

80.0%

A 26.2g sample of oxalic acid hydrate (H2C2O4 • 2H2O) is heated in an oven until all the water is driven off. How much of the anhydrous salt is left?

18.7 g

Round 2: Rubidium ignites spontaneously when exposed to oxygen to form Rb2O. Rubidium exists as two isotopes: Rb-85 (84.91u) and Rb-87 (86.91u). If the average atomic mass of Rubidium is 85.47u, determine the percentage abundance of Rb-85.

72%

How many grams are in 2.73 mol of lithium?

18.95 g

How many grams are in 3.05 mol of fluorine?

57.95 g

Round 8: Vitamin B12 (C17H20N4O6) is called riboflavin. What is the mass, in grams, of a single molecule of riboflavin?

6.25 x 10^-22 g

Round 9: Find the percentage composition of a pure substance that contains 7.22g nickel, 2.53g phosphorus and 5.25g oxygen.

Ni = 48.1% O = 35.0% P = 16.9%

How many grams are in 1.54 mol of beryllium?

13.88 g

Analysis of a metal chloride XCl3, shows that it contains 67.2% Cl by mass. Calculate the molar mass of X and identify the element.

Cr - Chromium

In one reaction, 0.507 mol of SiCl4 is produced. How many molecules of chlorine were used in the reaction?

6.10 X 10^23 molecules (1.014 moles)

Round 3: A small pin contains 0.0178 mol of iron (Fe). How many atoms of iron are in the pin?

1.07 x 10^22 atoms

Dinitrogen pentoxide is a white solid. When heated it decomposes to produce nitrogen dioxide and oxygen. 2N2O5(s) --> 4NO2(g) + O2(g) How many grams of oxygen gas will be produced in this reaction when 2.34g of NO2 are made?

0.406 g

How many moles are in 159.35 g of magnesium?

6.55 mol

Round 1: Naturally occurring silver exists as two isotopes. From the table above, calculate the average atomic mass of silver.

107.9 u

a reactant that is still present after a chemical reaction is complete

excess reagent

Round 10: Calculate the mass percent of nitrogen in Sr(NO3)2.

13.24%

A hydrate of zinc nitrate has the formula Zn(NO3)2*xH2O. If the mass of 1 mol of anhydrous zinc nitrate is 63.37% of the mass of 1 mol of hydrate, what is the value of x?

Zn(NO3)2*6H2O

Round 4: A sample of pure acetic acid CH3COOH contains 1.40 x 10^23 carbon atoms. How many moles of acetic acid are in the sample?

0.116 mol

What number of nitrogen atoms are present in 1.00 g of each of the N2H4?

3.76E22 atoms

4C3H6(g) + 6NO(g) --> 4C3H3N(g) + 6H2O(g) + N2(g) What is the limiting reagent when 126 g of C3H6 reacts with 175g of NO?

C3H6

Which of the following 100.0-g samples contains the greatest number of atoms?

Ca

Mg

Ag

Zn

Round 7: Sodium chloride (NaCl) can be used to melt snow. How many moles of sodium chloride are in a 10kg bag?

171.1 mol

Round 5: Find the molar mass of K2Cr2O7 and Fe2(SO4)3.

K2Cr2O7 = 294.2 g/mol Fe2(SO4)3 = 399.91 g/mol

How many grams are in 3.48 mol of neon?

70.23 g

Olive oil is used widely in cooking. Oleic acid, a component of olive oil, contains 76.54% carbon, 12.13% hydrogen and 11.33% oxygen by mass. What is the empirical formula of oleic acid?

C9H17O1

Calculate the molar mass of calcium carbonate

100.09 g/mol (1X40.08 + 1X12.01 +3X16.00)

The carat is the unit of mass used by jewelers. One carat is exactly 200mg. How many carbon atoms are present in a 1.5-carat diamond?

1.50 X 10^22 carbon atoms (0.0250 mol)

The following reaction proceeds with an 89% yield. C2H5OBr + NaOH --> C2H4O + NaBr + H2O What mass of C2H4O can be obtained when 3.61 x 10^23 molecules of C2H5OBr react with excess sodium hydroxide?

23.5 g

Round 6: Which sample has the largest mass? A) 5.00 mol of C B) 1.50 mol of Cl2 C) 0.50 mol of C6H12O6

B) Cl2 has 106 g

How many grams are in 1.94 mol of boron?

20.97 g

How many particles are in 7.91 moles?

4.76e24 particles

Round 12: A compound consists of 17.6% hydrogen and 82.4% nitrogen. Determine the empirical formula of the compound.

NH3

2NaN3(s) --> 3N2(g) + 2Na(s) To inflate the air bag on the driver’s side of the car, 80.0g of N2 is required. What mass of NaN3 is needed to produce 80.0g of N2?

124 g

Round 13: Compound X contains 69.9% carbon, 6.86% hydrogen, and 23.3% oxygen. Determine the empirical formula of Compound X.

C12H14O3

How many grams of H2O will be produced from the complete combustion of 26.7g of butane (C4H10)?

2.296 moles = 41.4 g

How many moles are in 84.26 g of aluminum?

3.12 mol

Solid lithium hydroxide is used in space vehicles to remove exhaled carbon dioxide from the living environment by forming solid lithium carbonate and liquid water What mass of gaseous carbon dioxide can be absorbed by 1.00 kg of LiOH

First: 2LiOH + CO2--? Li2CO3 + H2O (works out to 920 g of CO2 by 1.0 kg of CO2)