What is the molecular formula of the compound with a molecular weight of 112 g/mol and percent composition: 85.6% c and 14.4 % h

The molecular formula is C8H16

Explanation:

Step 1: Data given

The molecular weight = 112 g/mol

The compoun contains 85.6 % C and 14.4 % H

Step 2: Calculate mass of C and H

Let's consider 100 gram of this compound

⇒ 85.6 % of C = 85.6 grams of C

⇒ 14.4 % of H = 14.4 grams of H

Step 3: Calculate moles of C

Moles C = Mass C / molar mass C

Moles C = 85.6 grams / 12.0 g/mol

Moles C = 7.13 mol

Step 4: Calculate moles of H

Moles H = 14.4 grams / 1.01 g/mol

Moles H = 14.3 moles

Step 5: Calculate the mol ratio

We divide by the smallest amount of moles

C: 7.13/7.13 = 1

H: 14.3 / 7.13 = 2

The empirical formula is CH2

The molar mass of the empirical formula is 14.02 g/mol

Step 6: Calculate the molecular formula

We have to multiply the empirical formua by n

n = 112 g/mol / 14.02 g/mol

n = 8

The molecular formula is C8H16

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d

water   molecules stay close to each other through cohesion, the collective action of hydrogen bonds between water molecules. cohesion plants draw water upwards from the root through the stem's transport tubes (xylem) to the leaf. this transport occurs even in large trees and against gravity. transpiration, evaporation of water from plant leaves, creates a tension on water molecules being pulled up from the stem and roots.

water also has high (the attraction of one substance to another) properties because of its polar nature. adhesion of water molecules to plant cell walls counteract gravity while water is transported from roots to leaves.

water exhibits a very high surface tension when compared to other liquids. surface tension is a property of a liquid that holds the surface together and allows it to resist an external force. by capillary action, the water forms concave menisci inside the pores. the high surface tension of water pulls the concavity outwards, generating enough force to lift water from the roots to the leaves of plants.

thus, cohesion, along with adhesion and surface tension creates a capillary action that keeps water molecules interacting and moving through the plants out to the leaf cells.

therefore, option d) is the correct answer.

explanation: