Question

0.25 points Question 2400 =5628 Molarity Moliters of Solution 56.289 Ca) 271dg 6 A typical sample of brass is 67% copper and 33% zinc, and has a density of 8.40 g/mL. What is the molarity of this solution? 33= # of g 3M nG x 100 8,4091m 8400g/h ime 00 8400 -6,28g/c4 63.55g/cu I Mole PERIODIC TAD Atomic είς Symbol (rounded Agni KEY 1970 - Ατμιές AN - S-orbital block p-orbital block orbital Block orbitals Block Group designation Sblock (2) IIA

Answer 1

Let weight of solution = 100 gm

weight of copper in brass sample = 67 gm

moles of copper = Weight in gm / molar mass = 67 gm / 63.546 gm mol^-1= 1.054 mol Cu

moles of zinc = 33 gm / 65.38 gm mol^-1 = 0.504 mol

total moles = 1.054 mol + 0.504 mol = 1.558 mol

volume of solution = mass / density = 100 gm / 8.4 gm ml^-1 = 11.9 mL

molarity = mol / volume ( litre ) = 1.558 x 1000 mol / 11.9 litre = 130.92 M