Apr 23, 2016 · 36 Notice that these are all square numbers: 4 = 2xx2 9 = 3xx3 16 = 4xx4 25 = 5xx5 So we would expect the next number in the sequence to be: 36 = 6xx6 Another way of writing axxa is a^2.

Mar 8, 2016 · n^2 By studying the sequence you can see that it is a sequence of squares - 1^2, 2^2, 3^2, 4^2, 5^2,... so the nth term is n^2

Apr 6, 2016 · 25% of 90 is 22.5. A percent is any number over 100, so 25% is 25 over 100, this means that 25% can be written as: 25/100 Now, any number in fractional form (a number over a number) is the same as division so 25% can also be written as a decimal, we just move the decimal point 2 places to the right of 25, like this: 25/100= 0.25 Now we have two ways that we can solve this problem!

Feb 28, 2014 · M_AV_A = M_BV_B Let's assume you are titrating a strong acid (10 mL unknown concentration HCl) with a strong base (1.0 M NaOH). It takes 25mL of NaOH to neutralize the acid. If you solve for M_A you will see that M_A = (M_BV_B) / V_A or M_A = (1.0M x 25mL) / 10 M_A = 2.5M HCl This works because M = moles/L *Note: You do not need to convert volumes of acid and base to liters as long as both are ...

Mar 27, 2014 · You multiply the molarity by the number of osmoles that each solute produces. An osmole (Osmol) is 1 mol of particles that contribute to the osmotic pressure of a solution. For example, "NaCl" dissociates completely in water to form "Na"^+ ions and "Cl"^- ions. Thus, each mole of "NaCl" becomes two osmoles in solution: one mole of "Na"^+ and one mole of "Cl"^-". A solution of 1 mol/L "NaCl ...

For example, a 0.25 mol/L NaOH solution contains 0.25 mol of sodium hydroxide in every litre of solution. To calculate the molarity of a solution, you need to know the number of moles of solute and the total volume of the solution. To calculate molarity: Calculate the number of …

Mar 30, 2016 · 1/4=25% To express a fraction as percentage, what is needed is to modify the fraction so that the denominator is 100 and then numerator indicates the fraction as percentage. For example, if a/b=x/100, it can be written as x%.

Aug 31, 2014 · Here's one way to do it. > Example Concentrated hydrochloric acid is usually available at a concentration of 37.7% by mass. The density of the solution is 1.19 g/mL. What is its molar concentration? Solution Step 1. Calculate the mass of 1 L of solution. "Mass of solution" = 1000 color(red)(cancel(color(black)("mL soln"))) × "1.19 g soln" /(1color(red)(cancel(color(black)("mL soln ...

Aug 10, 2014 · (a) If 25 moles of NaCl are present in 100 L of a solution wherein H2O is the solvent, then the concentration of the solution is #25/100=0.25 "mol·L"^-1#. (b) What is the molarity of a solution prepared by dissolving 15.0 g of sodium hydroxide in enough water to make a total of 225 mL of solution? Solution

Jan 8, 2014 · What are the mole fraction and mole percent of sodium chloride and the mole fraction and mole percent of water in an aqueous solution containing 25.0 g water and 5.0 g sodium chloride? (a) Identify the components making up the solution. #"NaCl"# is the solute and #"H"_2"O"# is the solvent. (b) Calculate the moles of each component.