0.9775 grams of an unknown compound is dissolved in 50.0 ml of water. initially the water temperature is 22.3 degrees celsius. after addition of the solid, the solution temperature is raised to about 27.0 degrees celsius. the substance is known to have a molar mass of about 56 g/mol. calculate the enthlapy of solution in kj/mol.

The enthlapy of solution is -55.23 kJ/mol.

Explanation:

Mass of water = m

Density of water = 1 g/mL

Volume of water = 50.0 mL

m = Density of water × Volume of water = 1 g/mL × 50.0 mL=50.0 g

Change in temperature of the water ,ΔT= 27.0°C - 22.3°C = 4.7°C

Heat capacity of water,c =4.186 J/g°C

Heat gained by the water when an unknown compound is dissolved be Q

Q= mcΔT

heat released when 0.9775 grams of an unknown compound is dissolved in water will be same as that heat gained by water.

Q'=-Q

Q'= -983.71 J =-0.98371 kJ

Moles of unknown compound =

The enthlapy of solution :

The enthlapy of solution is -55.23 kJ/mol.

a. a primary source combines several different accounts of an event. b. a primary source generally benefits from having been written after an event.

explanation:

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.