Answer: Molarity of a solution : 0.416 M
In our question LiI(Lithium Iodide) is solute and we need to find the moles of LiI.
Given grams of LiI = 27.8g , Volume of solution = 500 mL
Molar mass of LiI = 133.85 g/mol
Moles of LiI = 0.208 mol
To find molarity we need volume of solution in 'L' , so we need to convert 500 mL to L.
1 L = 1000 mL
Volume = 0.5 L
Molarity = 
or 0.416 M
Answer is: a. harder.
Friedrich Mohs devised a scale that tested mineral hardness, which means the resistance of a mineral to being scratched. This scale (from 1 to 10) is known as the Mohs Hardness Test.
For examples:
fingernail (hardness = 2.5).
copper penny (hardness = 3)
glass plate or steel knife (hardness = 5.5)
steel file (hardness = 6.5).
According to this scale hardness of the mineral is between 5.5 and 6.5.
Answer:
the nucleus is made up of protons and neutrons
M=7M(H₂O)
M=7*18.015 g/mol = 126.105 g/mol
3 *0.75 = 2.25 mol that’s is ur answer for this question
