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 …

2C8H18 (l] +25O2 (g] → 16CO2 (g] + 18H2O(l] The 2:25 mole ratio that exists between the two reactants tells you that the reaction will consume 25 moles of oxygen gas for every 2 moles of …

Jun 30, 2017 · chi_ "NaOH" = 0.159 If I believe it to be true, you don't need the density value unless you're wanting to convert from molarity to mole fraction; we can calculate mole fraction …

A light emitting diode (L.E.D.) emits photons with an energy of 2.84 ×10−19 J. What is the energy per mole of photons emitted? Why are gravitational, electromagnetic, and nuclear forces often …

Use this equation to find the frequency of a photon that has a wavelength of #"12.4 cm"#. Notice that the speed of light is expressed in meters per second, so make sure that you convert the …

The added water to reach "100.00 mL" doesn't change the mols of HCl present, but it does decrease the concentration by a factor of 100//40 = 2.5. Regardless, what matters for …

The volume of the 40 molar solution required is "0.005 mL" or "5 mL". Refer to the explanation for the process. The symbol "M" represents molarity, which is "moles of solute"/"liters of solution". …

Sep 12, 2017 · Approx. 10*mL With all these problems, the priority is to write a stoichiometrically balanced equation: H_2SO_4 (aq) + 2NaOH (aq) rarr Na_2SO_4 (aq) + 2H_2O (l) And thus …

You would need 6.8 × 10^41color (white) (l) "molecules O"_3 to fill the hole. > Step 1. Convert grams of ozone to moles of ozone "Moles of O"_3 = 5.4 × 10 ^19 color ...

Explanation: ...and swirl it up in a bit of water.... (the solution will get hot!)...and then make up the volume to #500*mL#...the concentration of the solution will be approx.... # ( (20.0*g)/ …