A sample of nitrogen containing 3.0×10^23 molecules has the same number of molecules as a sample containing

A. 025 mole of 02
B. 2.0 moles of He
C. 1.0 mile of H2
D. 0.50 mole of Ne

Which one?

D) 0.50 mole of Ne

Explanation:

Given data:

Number of molecules of nitrogen = 3.0×10²³ molecules

Which sample contain same number of molecules as nitrogen= ?

Solution:

A) 0.25 mole of O₂

1 mole = 6.022×10²³ molecules

0.25 mol × 6.022×10²³ molecules / 1 mol

1.51×10²³ molecules

B) 2.0 moles of He.

1 mole = 6.022×10²³ molecules

2.0 mol × 6.022×10²³ molecules / 1 mol

12.044×10²³ molecules

C) 1.0 moles of H₂

1 mole = 6.022×10²³ molecules

D) 0.50 mole of Ne

1 mole = 6.022×10²³ molecules

0.50 mol × 6.022×10²³ molecules / 1 mol

3.0×10²³ molecules

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: