Which two processes allow water to enter the atmosphere? evaporation and transpiration precipitation and condensation condensation and evaporation transpiration and precipitation

The correct answer is evaporation and transpiration.

Explanation:

Evaporation: It is a process in which substance from its liquid state starts getting converted into gaseous state due increase in temperature. When water gets converted into water vapors due to this process  which allows water to enter in theatmosphere.

Transpiration: Vaporization of water from the plants.Plants absorbs water from the roots which get distributed to all the parts of plants. Water present in leaves, flower , stem gets vaporized and enters in the atmosphere.

Where as condensation is process where gaseous state of substance is converted in liquid state and precipitation is water released from the cloud sin the form of rain.

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1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%