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3 years ago

What is the mass of 2.3 x 1021 formula units of cobalt(II) bromate?

Chemistry

1 answer:

MissTica3 years ago

6 0

Molecular mass of Cobalt(II) Bromide = 218.7412 g/mol .

<u>Explanation:</u>

<u>Percent composition by element: </u>

The procedure to find the Molecular mass of Cobalt(II) Bromide:

The symbol of the Cobalt is Co.

The symbol of the Bromate is Br.

The Element cobalt have the Atomic Mass of 58.933200 with 1 number of atom.

The Element Bromine have the Atomic Mass of 79.904 with 2 number of atoms.

<u>Molecular weight calculation: </u>

To find the molecular mass we have to sum both of the Atomic masses:

For Cobalt(II) Bromide: We have to multiple the Atomic mass of bromate with 2 and then sum the atomic masses

$58.9332+79.904 \times 2 =218.7412g/mol$

Molecular mass of Cobalt(II) Bromide = 218.7412 g/mol

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a student adds 3.5 moles of solute to enough water to make a 1500mL solution. what is the concentration?

aksik [14]

<h2>Hello!</h2>

The answer is:

$MolarConcentration=\frac{3.5moles}{volume(1.5L)}=2.33molar$

Since there is not information about the solute but only its mass, we need to assume that we are calculating the molar concentration of a solution or molarity. So, need to use the following formula:

$MolarConcentration=\frac{mass(solute)}{volume(solution)}$

Now, we know that the mass of the solute is equal 3.5 moles and the volume is equal to 1500 mL or 1.5L

Then, substituting into the equation, we have:

$MolarConcentration=\frac{3.5moles}{1.5L}=2.33molar$

Have a nice day!

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Explanation:

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makkiz [27]

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