Stoichiometry: Moles, atomic mass

Atoms, Molecules, and the Mole!

4 Activities

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?

c) What is the mass in grams of 3.2 x 10-2 mol of acetominophen?

d) How many oxygen atoms are in 1.0 g of acetominophen?

e) What is the mass of exactly 1300 molecules of acetominophen?

f) What mass of acetominophen would contain 2.5 g of carbon?

Part a). Enter your answer to two decimal places.

Part b). Enter your answer to 4 significant figures.

Part c). Enter your answer to 2 significant figures

Part d). Enter your answer to 2 significant figures. For scientific notation, enter as: 3.2E2 for 320, for example.

Part e). Enter your answer to 2 significant figures. For scientific notation, enter as: 3.2E2 for 320, for example.

Part f). Enter your answer to 2 significant figures.

I don't know

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

Introduction to General Chemistry

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.

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}1.23⋅1018)

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}C atoms are there in 260 g of H2CO3\text{H}_2\text{CO}_3H2​CO3​?

Stoichiometry: Molar mass and Avogadro's Number

How many hydrogen atoms are in exactly 2 g of hydrazinium sulfate, N2H6SO4?