I’m sure I’m going to get a lot of flack for even asking, but after five years in Japan I can’t sit on this question any longer. What the heck are those huge moles so many Japanese have on their faces? I don’t mean the occasional freckle or demure beauty mark — I’m talking about enormous, protruding monster moles! I can’t begin to tell you how many Japanese I know, both men and women, who have big black moles on their faces. Are these kinds of moles specific to Japanese skin? Doesn’t it bother people to have moles in such a visible place? Why don’t they have them taken off?
In a time of both misinformation and too much information, quality journalism is more crucial than ever. By subscribing, you can help us get the story right.
The formula of molarity is shown below. To calculate the moles of solute, substitute the values of molarity and volume in the given formula. Therefore, the 0.03 moles of NaOH are present in 10.0 mL of a 3.00 M solution.
The mole, abbreviated mol, is an SI unit which measures the number of particles in a specific substance. One mole is equal to 6.02214179×1023 atoms, or other elementary units such as molecules.
We multiply 2.5 g NaCl by the conversion factor of 1 mole NaCl over the formula weight of NaCl, 58.5 g. That tells us that we have 0.0427 mole of NaCl. Now that we know the moles we can calculate the molarity. Moles of solute (0.0427) divided by the volume of the solution (0.125 L) gives us 0.34 M NaCl.
Answer and Explanation: A 3% solution contains 3 g of solute dissolved in 100 mL of the solution. The molar mass of NaCl is 58.5 g. Hence the osmolarity of 3% NaCl solution is 1020 mosM.
Answer and Explanation: In this solution, the solute is NaCl. Moles of NaCl = massmolar mass = 25 g58.44 g/mol =0.43 mol m a s s m o l a r m a s s = 25 g 58.44 g / m o l = 0.43 m o l . The volume of solution = 1 L.
Molarity is expressed in units of moles per liter (mol/L). It's such a common unit, it has its own symbol, which is a capital letter M. A solution that has the concentration 5 mol/L would be called a 5 M solution or said to have a concentration value of 5 molar.
It is important to distinguish the unit of mass (moles) from the unit of concentration (molarity). Moles are simply a unit of mass and are abbreviated as mol. Molarity is designated by an upper case “M” and is defined as moles per liter.
Explanation: It's a 3.0 M solution so 1 litre of solution contains 3 moles of NaOH. 250 ml of solution therefore contains 0.25 x 3 = 0.75 moles of NaOH.
Introduction: My name is Tish Haag, I am a excited, delightful, curious, beautiful, agreeable, enchanting, fancy person who loves writing and wants to share my knowledge and understanding with you.
We notice you're using an ad blocker
Without advertising income, we can't keep making this site awesome for you.
