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Convert each mass to moles. Express the answer inscientific notation.\begin{equation}a. 1.25 \times 10^{3} \mathrm{g} \mathrm{Zn} \quad \text { b. } 1.00 \mathrm{kg} \mathrm{Fe}\end{equation}

a.0.191$x 10^{2} \mathrm{mols}$b. 0.179$x 10^{2} \mathrm{mols}$

Chemistry 101

Chapter 10

The Mole

Chemical reactions and Stoichiometry

Sara J.

February 2, 2022

Convert each mass to moles. Express the answer in scientific notation. 1.25 \times 10^{3} \mathrm{g} \mathrm{Zn}1.25×10 3 gZn

Rice 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.

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we'll need the periodic table to convert these masses two moles so that we can find the molar mass. So one mole of zinc, according the periodic table, has a mass of 65.38 grams. I've set up the conversion factor. We're just simply going to do the math here. 1250 grams of zinc, divided by 65.38 grams of zinc, is 19.1 moles, Part B. I've got to do one extra step, and that's convert kilograms two grams, so 1000 grams per kilogram. I'm going to use the molar mass of iron, just like I did in the problem above. Except now, I guess, except for iron. And that's 55.85 grams per mole, setting up the conversion factor and now multiplying through. And I get 17.9 moles of iron

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