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LuckyWell [14K]
3 years ago
10

Calculate the molarity of a solution obtained dissolving 10.0 g of cobalt(Ⅱ) bromide hexahydrate in enough water to make 450 mL

of solution 7.64 × 10-2 6.80 × 10-2 0.102 M 8.55 × 10-2 6.80 × 10-5
Chemistry
1 answer:
katovenus [111]3 years ago
8 0

Answer:

The molarity of this solution is 6.8 * 10^-2 M

Explanation:

<u>Step 1:</u> Data given

Mass of CoBr*6H2O = 10.0 grams

Molar mass of cobalt(Ⅱ) bromide hexahydrate =

Volume of the solution = 450 mL = 0.450 L

<u>Step 2:</u> Calculate moles of cobalt(Ⅱ) bromide hexahydrate

Number of moles = Mass / molar mass

Number of moles = 10.0 grams / 326.85 g/mol

Number of moles = 0.0306 moles

<u>Step 3:</u> Calculate molarity of the solution

Molarity = number of moles / volume

Molarity = 0.0306 moles / 0.450L

Molarity = 0.068 M = 6.8 * 10^-2 M

The molarity of this solution is 6.8 * 10^-2 M

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Periodic table is the representation of elements in an order

The history of periodic table can be summarized as

a) 1829 :  Johann Dobereiner proposed the triad rule. According to him we can classify the elements in a triad where the atomic mass of middle element is average of atomic mass of the near by two atoms.

For example : Li, Na and K is a triad. Where atomic mass of Na is average of atomic mass of K

atomic mass of Na = 7+ 39 / 2 = 23

However, with the further discovery of elements the law was rejected.

b) 1864  : John Newland proposed the law of octave. According to him we can arrange the elements in a set of seven elements where the property of second set of seven elements will resemble the properties of first of seven elements or property will be repeated after seven elements. This was also rejected due to its limited applicability.

c)  Meyer : He arranged some 28 elements into six different families based on their atomic masses. The members of each familiy shared some common properties.

d) 1869 : Mendleev :  He actually developed a periodic table based on atomic mass of elements. He arranged the elements into groups and periods. He even left space for some undiscovered elements, which were later on discovered.

e) 1916 : Henry Moseley : He finally arranged elements based on their atomic number based on X-ray studies. He proposed the modern periodic law that the periodic properties of elements are due to atomic number of elements.



6 0
3 years ago
Ammonia (NH3) is widely used as a fertilizer
ratelena [41]

Answer:

82.28g

Explanation:

Given parameters:

Number of moles of hydrogen gas = 7.26 moles

Unknown:

Amount of ammonia produced = ?

Solution:

We have to write the balanced equation first.

              N₂    +   3H₂    →    2NH₃

Now, we work from the known to the unknown;

   

                  3 moles of H₂ will produce 2 moles of NH₃

                7.26 mole of H₂ will produce \frac{7.26 x 2}{3}  = 4.84 moles of NH₃

Molar mass of NH₃ = 14 + 3(1) = 17g/mol

Mass of NH₃  = number of moles  x molar mass = 4.84 x 17 = 82.28g

3 0
3 years ago
Https://aoa.sooschools.com/media/a_scigen02_2016/3/s803_31.gif
telo118 [61]

The pH scale was given by Sorensen to quanitatively define strength of an acid and base

the pH scale extends from 0 to 14

For acids

The pH should be less than 7 [always]

For base

The pH should be more than 7 [always]

The pH seven is of neutral solution

pH = -log[H+]

Thus lower the pH higher the concentration of hydronium ion or protons produced by an acid

thus for the given pH scale interval [0-3] it represents strong acid [Which will give high concentration of protons on dissociation]

4 0
3 years ago
Read 2 more answers
there are 1540 megawatts of wind-generated electricity produced globally every year. This amount is equivalent to how many kilow
Reptile [31]

1.54 x 10⁶kW

Explanation:

The problem here is converting from megawatts into kilowatts.

  Given 1540megawatts.

The mega- and kilo- watts are prefixes that denotes multiples of units.

  1 megawatt = 10⁶watts

  1 kilowatt = 10³watts

Now given 1540megawatts power to Kilowatt power;

   We see that :

   1000kW = 1mW

 1540mW x \frac{1000kW}{1mW} = 1.54 x 10⁶kW

learn more:

energy units brainly.com/question/4791744

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4 0
3 years ago
Determine how many liters of hydrogen adjusted to STP there are in a 50.0 liter steel cylinder if the pressure inside is 100.0 a
Dvinal [7]

Answer : The volume of hydrogen gas at STP is 4550 L.

Explanation :

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1 = initial pressure of gas = 100.0 atm

P_2 = final pressure of gas at STP = 1 atm

V_1 = initial volume of gas = 50.0 L

V_2 = final volume of gas at STP = ?

T_1 = initial temperature of gas = 27.0^oC=273+27.0=300K

T_2 = final temperature of gas at STP = 0^oC=273+0=273K

Now put all the given values in the above equation, we get:

\frac{100.0atm\times 50.0L}{300K}=\frac{1atm\times V_2}{273K}

V_2=4550L

Therefore, the volume of hydrogen gas at STP is 4550 L.

3 0
3 years ago
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