3. A mass spectrometer is an instrument that can be used to determine the mass of a substance. A

Can you dissolve. 35 moles of potassium permanganate (kmno4) into 500 ml of water? _________ why? / why not?

Greeley [361]

Yes, we can dissolve 35 moles of KMnO₄ into 500 mL of water to give a molarity of 70 M

<h3>What is molarity? </h3>

Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

<h3>How to determine the molarity </h3>

Mole of KMnO₄ = 35 moles
Volume = 500 mL = 500 / 1000 = 0.5 L

Molarity =?

Molarity = mole / Volume

Molarity = 35 / 0.5

Molarity = 70 M

Learn more about molarity:

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3 0

2 years ago

Read 2 more answers

Determine the number of moles of the anhydrous salt present after heating, assuming that the contents of the aluminum cup after

lara31 [8.8K]

Answer:

0.2 moles, assuming weight of dried salt

Explanation:

In order to determine the number of moles, we need to be aware of the mass of the substance in question.

Assuming the mass of the dehydrated $KAl(SO_{4} )_{2}.H_{2} O$ is 50g.

No. of moles = mass of substance/ molar mass of the substance.

= $\frac{50g}{39+27+32*2+16*4*2\\)g/mol}$

= 0.2 moles moles.

6 0

3 years ago

List the three principal states of matter, give two examples of each

icang [17]

matter can take be one of the three states which are; (Solid, Liquid, Gas)

Think about water, it can be a Solid (Ice) a Liquid (not frozen obviously) and a Gas (when it evaporates)

7 0

3 years ago

You are given a stock solution of 500.0 mL of 1.00M magnesium chloride solution. Calculate the volume of the stock solution you

alexgriva [62]

Answer:

$50\; \rm mL$ of the stock solution would be required.

Explanation:

Assume that a solution of volume $V$ contains a solute with a concentration of $c$ . The quantity $n$ of that solute in this solution would be:

$n = c \cdot V$ .

For the solution that needs to be prepared, $c = 0.20\; \rm M = 0.20\; \rm mol \cdot L^{-1}$ . The volume of this solution is $V = 250.0\; \rm mL$ . Calculate the quantity of the solute (magnesium chloride) in the required solution:

$\begin{aligned}n &= c \cdot V \\ &= 0.20\; \rm mol \cdot L^{-1} \times 250.0\; \rm mL \\ &= 0.20\; \rm mol \cdot L^{-1} \times 0.2500\; \rm L \\ &= 0.050\; \rm mol\end{aligned}$ .

Rearrange the equation $n = c \cdot V$ to find an expression of volume $V$ , given the concentration $c$ and quantity $n$ of the solute:

$\displaystyle V= \frac{n}{c}$ .

Concentration of the solute in the stock solution: $c(\text{stock}) = 1.00\; \rm M = 1.00\; \rm mol \cdot L^{-1}$ .

Quantity of the solute required: $n = 0.050\; \rm mol$ .

Calculate the volume of the stock solution that would contain the required $n = 0.050\; \rm mol$ of the magnesium chloride solute:

$\begin{aligned}& V(\text{stock}) \\ &= \frac{n}{c(\text{stock})} \\ &= \frac{0.050\; \rm mol}{1.00\; \rm mol \cdot L^{-1}} \\ &= 0.050\; \rm L \\ &= 50\; \rm mL\end{aligned}$ .

3 0

3 years ago

Identify the correct ranking of bonds or forces in order from strongest to weakest is:

Artemon [7]

The answer is (in order from strongest to weakest);

<span>covalent </span>

<span>ionic </span>

ion-dipole

H-bonding

dipole-dipole

<span>van der Waals</span>

A covalent<span> bond is hardest to break because it involves sharing of electrons by atoms while Van der Waals is weakest because they involve electrostatic attraction due to differentially induced dipoles between atoms and its strength is dependent on their distance apart. </span>

7 0

3 years ago