Which of the following is an inorganic compound?

What is the molarity of 225 grams of Cu(NO2)2 in a total volume of 2.59 L?

Kay [80]

Answer:

The molarity is 0.56 $\frac{moles}{L}$

Explanation:

In a mixture, the chemical present in the greatest amount is called a solvent, while the other components are called solutes. Then, the molarity or molar concentration is the number of moles of solute per liter of solution.

In other words, molarity is the number of moles of solute that are dissolved in a given volume.

The Molarity of a solution is determined by:

$Molarity (M)=\frac{number of moles of solute}{Volume}$

Molarity is expressed in units ( $\frac{moles}{liter}$ ).

Then you must know the number of moles of Cu(NO₂)₂. For that it is necessary to know the molar mass. Being:

Cu: 63.54 g/mol
N: 14 g/mol
O: 16 g/mol

the molar mass of Cu(NO₂)₂ is:

Cu(NO₂)₂= 63.54 g/mol + 2*(14 g/mol + 2* 16 g/mol)= 155.54 g/mol

Now the following rule of three applies: if 155.54 g are in 1 mole of the compound, 225 g in how many moles are they?

$moles=\frac{225 g*1 mole}{155.54 g}$

moles= 1.45

So you know:

number of moles of solute= 1.45 moles
volume=2.59 L

Replacing in the definition of molarity:

$Molarity=\frac{1.45 moles}{2.59 L}$

Molarity= 0.56 $\frac{moles}{L}$

The molarity is 0.56 $\frac{moles}{L}$

5 0

3 years ago

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AVprozaik [17]

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3 0

3 years ago

Please help ill give you a 100 points! Its urgent!! Q^Q

Sergio [31]

Answer:

1. C.

Explanation:

8 0

3 years ago

Read 2 more answers

What causes Earth’s major wind patterns?

lapo4ka [179]

Answer:

A.

Explanation:

The sun unevenly hits the Earth, causing wind to form and move around the poles; never constant.

5 0

3 years ago

Read 2 more answers

Help asap. How many moles are 5.55x10^25 atoms of Mg

LekaFEV [45]

Answer:

$\boxed {\boxed {\sf About \ 92.2 \ moles \ of \ Magnesium}}$

Explanation:

To convert from atoms to moles, we must Avogadro's number:

6.022*10²³

This number tells us the amount of particles (atoms, molecules, etc.) in 1 mole of a substance. In this case, it is atoms of magnesium in 1 mole.

6.022 *10²³ atoms Mg / 1 mol mg

Now, let's set up an expression using:

$\frac {6.022 * 10^ {23} \ atoms \ Mg}{ 1 \ mol \ Mg}$

Multiply this by the given number of atoms.

$5.55*10^{25} \ atoms \ Mg *\frac {6.022 * 10^ {23} \ atoms \ Mg}{ 1 \ mol \ Mg}$

Flip the fraction so the atoms of magnesium can cancel.

$5.55*10^{25} \ atoms \ Mg *\frac { 1 \ mol \ Mg }{6.022 * 10^ {23} \ atoms \ Mg}$

$5.55*10^{25} *\frac { 1 \ mol \ Mg }{6.022 * 10^ {23}}$

Multiply and condense this into 1 fraction.

$\frac { 5.55*10^{25} \ mol \ Mg }{6.022 * 10^ {23}}$

$92.1620724 \ mol \ Mg$

The original measurement had 3 significant figures, so our answer must have that many as well. For the number we calculated, that is the tenth place. The 6 in the hundredth place tells us to round the 1 to a 2.

$92.2 \ mol \ Mg$

It is about 92.2 moles of magnesium.

3 0

3 years ago