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(a) Determine the mass of calcium metal that contains the same number of moles as $89.6 \mathrm{g}$ of zinc metal. (b) Calculate the number of moles of molecular fluorine that has the same mass as 36.9 moles of argon. (c) What is the mass of sulfuric acid that contains 0.56 mole of oxygen atoms? (d) Determine the number of moles of phosphoric acid that contains $2.12 \mathrm{g}$ of hydrogen atoms.

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a.) $54.92 \mathrm{g}$b.) $38.80 \mathrm{mol}$c.) $38.80 \mathrm{mol}$d.) $0.70 \mathrm{mol}$

Chemistry 101

Chapter 3

Mass Relationships in Chemical Reactions

Chemical reactions and Stoichiometry

Rice University

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Brown University

University of Toronto

Lectures

04:02

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Chemical reactions can be either spontaneous, requiring no input of energy, or non-spontaneous, typically following the input of some type of energy, such as heat, light or electricity. Chemical reactions are usually characterized by a chemical change, and they yield one or more products after the reaction is complete. Chemical reactions are described with chemical equations, which symbolically present the starting materials, end products, and sometimes intermediate products and reaction conditions. Chemical reactions happen at a characteristic reaction rate at a given temperature and chemical concentration. Typically, reaction rates increase with increasing temperature because there is more thermal energy available to reach the activation energy necessary for breaking bonds between atoms.

08:02

In chemistry, a combination reaction is a chemical reaction in which two or more reactants combine to form more than one product. In a decomposition reaction, one reactant splits into two or more products.

11:40

Find the number of atoms i…

15:00

Determine the number of mo…

04:46

08:57

Find the number of moles f…

06:54

Determine(a) the numbe…

04:50

Calculate the mass in gram…

00:52

Atoms and the MoleCalc…

05:52

Calculate each of the foll…

02:08

Calculate the mass, in gra…

01:42

Calculate the molar mass (…

01:55

09:30

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