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3 years ago

Combined gas law, PLEASE HELP!

Chemistry

1 answer:

katrin2010 [14]3 years ago

5 0

You correctly said that you need the combined gas law.

combine gas law----> P1V1/T1= P2V2/T2

P1= ?
V1= 2.58 L
T1= 368K

P2= 777 torr
V2= 1.53 L
T2= 495K

Now we plug in the values.

(P1 X 2.58)/ 368= (777 X 1.53)/ 495 K

P1= 343 torr

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What is the molarity of a potassium triiodide solution, KI3(aq), if 30.00 mL of the solution is required to completely react wit

vfiekz [6]

Answer:

The molarity is 0.203 M

Explanation:

Using the formula C(oxi) x V(oxi) / [C(red) x V(red)] = N(oxi) / N(red)

Where oxi and red means reducing agent and oxidising agent respectively.

C = Concentration, V = Volume and N = number of moles.

C(oxi) = 0.5 M

V(oxi) = mL

C(red) = ?

V(red) = 30mL

Equation of reaction = 2K2S2O3 + KI3 = K2S4O6 + 3KI

so N(red) = 1 , N(oxi) = 2

from the equation above,

C(red) = 0.5 x 25 x 1 / (2 x 30)

= 0.203 M.

3 0

3 years ago

A sample of hydrogen has an initial temperature of 50.°

Lena [83]

Using the
V1/T1=V2/T2
where
T1=50C= 323.15K
T2= -5C=268.15 K
V2= 212m^3
substitute the given values, we will get the initial volume
V1=V2T1/T2
V1= 255.48m^3

The initial volume is 255.48m^3

6 0

4 years ago

Each of the following names is wrong. Draw structures based on them, and correct the names:(b) 1,1,1-trimethylheptane

devlian [24]

The correct IUPAC name of 1,1,1-trimethylheptane is 2,2-dimethyloctane.

<h3>IUPAC NAME:</h3>

It is systematic way of nomenclature of organic compounds.

It is based on the position of functional groups, preference of the functional group, long or short chain of carbon, preference of double bond, single and triple bond, branching of carbon chain, etc.

The given compound is 1,1,1-trimethylheptane.

The given name is wrong according to IUPAC name because the numbering of carbon atom should be done in that way in which the carbon atom chain is largest.

Here, in this case the numbering is done from right side. Thus the largest carbon chain have 8 carbon atom.

If the numbering is done according to the question, number of carbon atom in straight chain is 7.

Thus, we concluded that the Correct IUPAC name of 1,1,1-trimethylheptane is 2,2-dimethyloctane.

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5 0

2 years ago

What is the freezing point of a solution in which 2.50 grams of sodium chloride are added to 230.0 ml of water

labwork [276]

The freezing point of a solution in which 2.5 grams of NaCl is added t0 230 ml of water is : - 0.69°C

<h3>Determine the freezing point of the solution </h3>

First step : Calculate the molality of NaCl

molality = ( 2.5 grams / 58.44 g/mol ) / ( 230 * 10⁻³ kg/ml )

= 0.186 mol/kg

Next step : Calculate freezing point depression temperature

T = 2 * 0.186 * kf

where : kf = 1.86°c.kg/mole

Hence; T = 2 * 0.186 * 1.86 = 0.69°C

Freezing point of the solution

Freezing temperature of solvent - freezing point depression temperature

0°C - 0.69°C = - 0.69°C

Hence the Freezing temperature of the solution is - 0.69°C

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8 0

3 years ago

Look at the screenshot ;)

SashulF [63]

This is not the best way to organize a periodic table because two elements might have similar atomic mass.

<h3>What is periodic table?</h3>

Periodic table is a chart in which arrangement of chemical elements are done.

In the early periodic table elements are arranged on the basis of their atomic masses, while after sometime Moseley arranged the periodic table on the basis of atomic number as he proposed that properties of an element is justified on the basis of number if electrons.

And mass of two substances may be same so it is difficult to differentiate between them.

Hence, two elements might have similar atomic mass.

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6 0

2 years ago