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Volgvan
3 years ago
13

What mass of calcium carbonate, CaCO3, must be decomposed to give 14g of calcium oxide, CaO?

Chemistry
1 answer:
svetoff [14.1K]3 years ago
7 0

Answer:

Mass of CaCO₃ decomposed = 25 g

Explanation:

Given data:

Mass of CaCO₃ decomposed = ?

Mass of CaO produced = 14 g

Solution:

Chemical equation:

CaCO₃        →       CaO + CO₂

Number of moles of CaO:

Number of moles = mass/molar mass

Number of moles = 14 g/ 56 g/mol

Number of moles =0.25 mol

Now we will compare the moles of CaO with CaCO₃.

                      CaO            :          CaCO₃

                         1               :               1

                      0.25           :            0.25

Mass of CaCO₃:

Mass = number of moles × molar mass

Mass = 0.25 mol × 100 g/mol

Mass = 25 g

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The net ionic equation formed is

       Ag^+(aq)+Cl^−(aq)→AgCl(s)

Chromium(III) nitrate and silver(I) chloride are the products of the balanced molecular equation for the reaction between chromium(III) chloride and silver(I) nitrate. An (s) next to the chemical formula for silver(I) chloride designates it as an insoluble salt.

      CrCl3(aq)+3AgNO3(aq)→Cr(NO3)3(aq)+3AgCl(s)

Silver and the chloride ions are the two ions that must interact to create silver(I) chloride. By designating ions as the reactants and silver(I) chloride as the product, the net ionic equation is formed.

      Ag^+(aq)+Cl^−(aq)→AgCl(s)

Ionic Equation:

In general, anions and cations react to generate a compound in a dissolved media, which is known as an ionic reaction. Water-insoluble salts are created when the ions of water-soluble salts interact with one another in an aqueous media.

To learn more about Ionic equaion click the given link

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Answer:

  • <u>Cadmium has larger atomic radius than sulfur.</u>

Explanation:

Down a period, atomic radii decrease from left to right due to the increase in the number of protons and electrons across a period: when a proton is added the pull of the electrons towards the nucleus is larger, so the size of the atom decreases.

Hence, you can compare the elements that belong to a same period and predict that the atom with lower atomic number (number of protons) will haver larger atomic radius. With that:

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Now see whan happens down a group. Atomic radius increases from top to bottom within a group due to electron shielding. That permits you to compare the size of the elements in a group:

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