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Introduction to General Chemistry

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Wize University Chemistry Textbook > Stoichiometry

Atoms, Molecules, and the Mole!

4 Activities

Answer the following questions concerning benzoic acid (C7H6O2).

a) Calculate the number of moles in a 7.50 x 10-2 g sample of benzoic acid.


b) Calculate the number of molecules of benzoic acid in the 7.50 x 10-2 g sample.


c) Calculate the concentration (in mol/L) of a 7.50 x 10-2 g sample of benzoic acid dissolved in 100.0 mL of water.


d) Calculate the number of hydrogen atoms in a 7.50 x 10-2 g sample of benzoic acid.


More Atoms, Molecules, and the Mole! Questions:
Combustion, Stoichiometry
What mass of KClO3 is required to produce proper amount of O2 needed to achieve complete combustion of 78.88 g CH4?
2 KClO3 → 2 KCl + 3 O2
Given that the molar mass of X is 170.12 g mol-1, how many molecules of X are present in a tablet that contains 100 mg of X?
Calculate the molar mass of H2O
Chemical reactions: Limiting Reagent & Percent Yield
Iron oxidizes when exposed to oxygen to form iron oxide according to the following equation:
Fe (s) + O2 (g) ​→ Fe2​O3​ (s)
352g of pure iron is exposed to 12.0 mols of O2, and after a period of time, 46.7 g of iron oxide (rust) is collected.
Molecules: Molar mass
Calculate the number of moles of each compound:
a. 18.5 g of MgCO3
b. 2.36 g of NF3
Stoichiometry: Chemical formula
How many carbon atoms are in 10.00 mL of ethanol ( CH3CH2OH)?
The density of ethanol is 0.789 g/mL.
Practice: Finding the Number of Moles of Iron
Calculate the number of moles of Iron atoms in 14.1 g of iron oxide, Fe2O3
Stoichiometry: Moles, atomic mass
Acetominophen (C8H9NO2) is a common drug used to treat pain and fever. It is the main component of common trade names such as Tylenol.
a) Calculate the molar mass of acetominophen.
b) How many moles of acetominophen are there in 250.0 g of this compound?
Converting Mass to Number of Atoms
Calculate the number of nitrogen atoms in 2.25 g of bismuth(III) nitrate. (Enter your answer in scientific notation in nitrogen atoms, for example 1.23⋅10181.23\cdot10^{18})
How many grams of oxygen are in 22 mL of water? Remember that the density of water is 1.0 g/mL
How many moles of ammonia (NH3) are in 2.4g of ammonia?
Chemical formula: Moles
Which of the following quantities is not equivalent to 5 mg of sodium bicarbonate,NaHCO3?
Stoichiometry: Finding the Number of Moles of Iron
Calculate the number of moles of iron atoms in 14.1 g of iron oxide, Fe2O3
Atoms: Avogadro's Number
How many C\text{C} atoms are there in 260 g of H2CO3\text{H}_2\text{CO}_3?
Stoichiometry: Molar mass and Avogadro's Number
How many hydrogen atoms are in exactly 2 g of hydrazinium sulfate, N2H6SO4?