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3 years ago

What is the molality of a solution made by dissolving 0.0816 moles of

Chemistry

1 answer:

Paul [167]3 years ago

3 0

Answer:

m = 0.544 moles/kg

Explanation:

To do this, we need to use the expression for molality of a solution which is:

m = n / kg water

Where:

n: moles of solute

m: molality of solution

In this case, we have the moles of the solute, which is the C6H12O6 and the grams of water, and these grams would have to be turn into kg. Let's do this first:

kg of water = 150 g * 1 kg / 1000 g = 0.150 kg of water.

Now, replacing in the above expression of molality, we can calculate the molality of the solution:

m = 0.0816 / 0.150

<h2>m = 0.544 moles/kg</h2>

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Determine the differences In electronegativity ionic radius atomic radius and first ionization energy for oxygen and beryllium

Vilka [71]

Answer:

Electronegativity = 1.87.

Ionic radius = 109 pm.

Atomic radius = -39 pm

First ionization energy = 410 kJ/mol

Explanation:

Hello!

In this case, since electronegativity, ionic radius, atomic radius and first ionization energy are periodic properties that have specific trends, we can summarize it by realizing that oxygen and beryllium belong the same period 2 and differ in group, 6A and 2A respectively.

In such a way, the required comparison is written below:

Electronegativity = 3.44 (oxygen) - 1.57 (beryllium) = 1.87.

Ionic radius = 140 pm (oxygen)- 31 pm (beryllium) = 109.

Atomic radius = 73 pm (oxygen) - 112 pm (beryllium) = -39 pm

First ionization energy = 1310 kJ/mol (oxygen) - 900 kJ/mol (beryllium) = 410 kJ/mol

It means that electronegativity, ionic radius and first ionization energy increases from left to right whereas the atomic radius from right to left.

Best regards!

7 0

3 years ago

How many carbon atoms are there in a diamond (pure carbon) with a mass of 55 mg ?

kari74 [83]

1 mol of Carbon = 12 grams.
x mol of Carbon = 55 grams

12*x = 1 * 55
x = 55/12
x = 4.583333 mols of carbon

1 mol of anything is 6.02 * 10^23 atoms
4.58333333 mol = x

1/4.5833333 = 6.02 * 10^23/x
x = 4.58333* 6.02*10^23
x = 2.7591 * 10^23 Carbon atoms

3 0

3 years ago

The half-life of a radioactive isotope is the amount of time it takes for a quantity of that isotope to decay to one half of its

Sedaia [141]

Radio active decay reactions follow first order rate kinetics.

a) The half life and decay constant for radio active decay reactions are related by the equation:

$t_{\frac{1}{2}} =$ $\frac{ln 2}{k}$

$t_{\frac{1}{2}} = \frac{0.693}{k}$

Where k is the decay constant

b) Finding out the decay constant for the decay of C-14 isotope:

$Decay constant (k) = \frac{0.693}{t_{\frac{1}{2}}}$

$k = \frac{0.693}{5230 years}$

$k = 1.325 * 10^{-4} yr^{-1}$

c) Finding the age of the sample :

35 % of the radiocarbon is present currently.

The first order rate equation is,

$[A] = [A_{0}]e^{-kt}$

$\frac{[A]}{[A_{0}]} = e^{-kt}$

$\frac{35}{100} = e^{-(1.325 *10^{-4})t}$

$ln(0.35) = -(1.325 *10^{-4})(t)$

t = 7923 years

Therefore, age of the sample is 7923 years.

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3 years ago

Banana dipped in liquid experiments

aleksley [76]

Https://www.youtube.com/watch?v=LXDG0nqYdR4

4 0

4 years ago

Which of these oxides will likely form a colored solution when dissolved in water?

Alik [6]

Mn₂O

Explanation:

The oxide that will most likely form colored solutions is Mn₂O.

This is because most transition metals form colored compounds. Manganese is a transition metal belonging to the d-block on the periodic table.

Other examples of transition metals are scandium, titanium, iron, copper, cobalt, nickel, zinc
They belong to the d-block on the periodic table.
They have variable oxidation states.
Most of their solutions are always colored.

Learn more:

Periodic table brainly.com/question/8543126

#learnwithBrainly

7 0

4 years ago