Menthol, the substance we can smell in mentholated cough drops, is composed of c, h, and o. a 6.030×10−2 −mg sample of menthol is combusted, producing 0.1697 mg of co2 and 6.954×10−2 mg of h2o. what is the empirical formula for menthol?

The empirical formula is =

Explanation:

Mass of water obtained =

Also, 1 mg = g

So, mass of water =

Molar mass of water = 18 g/mol

Moles of = /18 g/mol =  3.8634×10⁻⁶ moles

2 moles of hydrogen atoms are present in 1 mole of water. So,

Moles of H = 2 x 3.8634×10⁻⁶ = 7.7267×10⁻⁶ moles

Molar mass of H atom = 1.008 g/mol

Mass of H in molecule = 7.7267×10⁻⁶ x 1.008 = 7.6653×10⁻⁶ g

Mass of carbon dioxide obtained = 0.1697 mg

Also, 1 mg = g

So, mass of carbon dioxide =

Molar mass of carbon dioxide = 44.01 g/mol

Moles of =  /44.01 g/mol = 3.856×10⁻⁶ moles

1 mole of carbon atoms are present in 1 mole of carbon dioxide. So,

Moles of C = 3.856×10⁻⁶ moles

Molar mass of C atom = 12.0107 g/mol

Mass of C in molecule = 3.856×10⁻⁶ x 12.0107 = 46.3132 ×10⁻⁶ g

Given that the Menthol only contains hydrogen, oxygen and carbon. So,

Mass of O in the sample = Total mass - Mass of C  - Mass of H

Mass of the sample =

Also, 1 mg = g

So, mass of sample =

Mass of O in sample = ( 60.30 - 7.6653 - 46.3132 ) ×10⁻⁶ g= 6.3215×10⁻⁶ g

Molar mass of O = 15.999 g/mol

Moles of O  = 6.3215×10⁻⁶  / 15.999  = 0.3951×10⁻⁶ moles

Taking the simplest ratio for H, O and C as:

7.7267×10⁻⁶ : 0.3951×10⁻⁶ : 3.856×10⁻⁶

= 20 : 1 : 10

The empirical formula is =

answer: at room temperature (roughly 20 degrees c), you can dissolve 203.9 grams (or 200 grams) of sugar in 100 ml of water. as water temperature increases, the amount of sugar that will dissolve increases, up to about 500 grams of sugar in 100 ml water at 100 degrees c.

explanation:

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.