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vampirchik [111]
3 years ago
5

A 0.380 g sample of an unknown monoprotic acid is titrated with 0.300 M KOH to the equivalence point. It requires 20.1 mL of KOH

to reach this point. Elemental analysis is also performed, showing that the acid contains 1.6% H, 22.2% N, and 76.2% O. Use this information to determine the molecular formula and the molar mass of the unknown acid.
Chemistry
1 answer:
kolezko [41]3 years ago
3 0

Answer:

Explanation:

20.1 mL of .3 M KOH reacts with .38 g of sample monoprotic acid

20.1 mL of .3 M KOH = .021 x .3 mole of KOH

= .0063 mole of KOH

.0063 mole of KOH will react with .0063 mole of monoprotic acid

.0063 mole of monoprotic acid = .38 g

1 mole of monoprotic acid = 60.3 or 60 g

molecular weight of monoprotic acid = 60

Acid contains 1.6 % H , 22.2 % N , 76.2 % O

Ratio of weight of H , N , O in sample

= 1.6 : 22.2 : 76.2

Ratio of moles of H , N , O

1.6 / 1 : 22.2 / 14 : 76.2 / 16

1.6 : 1.585 : 4.76

= 1.6 / 1.585 : 1 : 4.76 / 1.585

= 1 : 1 : 3

Empirical formula

= HNO₃

Mol formula = (HNO_3)_n ( let )

Mol weight = n ( 1 + 14 + 3 x 16 )

= 63n  .

Mol weight calculated above = 60

63n = 60

n = 1 ( approx )

Mol formula = HNO₃

Mol mass =   63 .

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5 0
3 years ago
A sample of iron metal is placed in a graduated cylinder. it is noted that 10.4 ml of water is displaced by the iron. the iron i
Pavel [41]
<h3>Answer:</h3>

                 162.43 g of FeCl₂

<h3>Explanation:</h3>

Step 1: Calculate mass of Fe;

As,

                                   Density  =  Mass ÷ Volume

Or,

                                   Mass  =  Density × Volume

Where Volume is the volume of water displaced  =  10.4 mL

Putting values,

                                   Mass  =  7.86 g.mL⁻¹ × 10.4 mL

                                   Mass  =  81.744 g of Fe

Step 2: Calculate amount of FeCl₂;

The balance chemical equation is as follow,

                                Fe  +  2 HCl   →    FeCl₂  +  H₂ ↑

According to this equation,

       55.85 g (1 mol) Fe produced  =  110.98 g (1 mol) of FeCl₂

So,

               81.744 g Fe will produce  =  X g of FeCl₂

Solving for X,

                    X  =  (81.744 g × 110.98 g) ÷ 55.85 g

                     X =  162.43 g of FeCl₂

7 0
3 years ago
What is the relationship among solutions solutes and solvents
jenyasd209 [6]

Answer:

Solvents are substances in which solutes dissolves while solutes are substances that dissolve in solvents and solutions result from mixing solvents and solutes.

Explanation:

  • A solvent is a substance such as water that dissolves a solute.
  • A solute is a substance that dissolves in a solvent. For example, when sodium chloride dissolves in water, sodium chloride is the solute and water is the solvent.
  • A solution, on the other hand, results from combining a solute and a solvent. Therefore, a mixture of water and sodium chloride forms the solution.
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3 years ago
Rank the following substances in order from most soluble in water to least soluble in water: methane, CH4; 2-butanol, C4H9OH; ma
inna [77]

Answer:

MgCl2 > C4H9OH > CH4 > C3H8.

Explanation:

Alkanes do not form hydrogen bonds and are insoluble in polar solvents e.g water. The hydrogen bonds between water molecules are move away from an alkane molecule and this worsens as their Carbon chain / molecular weight increases.

MgCl2 is soluble in water. Water essentially breaks down the ionic crystal lattice and the resulting solution is slightly basic.

Alcohols are generally soluble in water and this is because of the -OH group and its ability to form hydrogen bonds with water molecules. As applied to alkanes, as the carbon chain in the alkyl group increases, the solubility decreases.

From the most soluble to the least soluble,

MgCl2 > C4H9OH > CH4 > C3H8.

4 0
3 years ago
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