Question

helppp

1- Calculate the following: A- Number of moles in 10 gram of Cr(NO3)s. B- Number of Atoms in 10 gram of Cr(NO3)s. C- Number of molecules in 10 gram of Cr(NO3)s. D- Number of grams in 10 atoms of Cr(NO3)s. 2. Find the % composition of all individuals in, KBrOn. %K= %Br= %0=

Answer 1

given mass moles Molay mass in 1ogram of 1 ANumber of moles C7(NOs)5 mass of Cr(NO3 J 629om/met mass of N 144Tam/m el ot O-164ram/mel Molar Molar Molar Molas mass mass of Cr= of 62+ (14+ 16*3)x6 Molar mas 362nol Namber of moles in Logram of 03 3629/me O.0216mo Crales Number of atoms in 10grom of in CrNo5 -motesx (ntonms in CrNo,l)xNA Avegadro Number in CrNo,)5 NA atoms or elemens 1+1+3)x5 - 21atoms

NUmber of atoms in CNO3)4 10 x21 X G.02 X1023 362 3.49X1023 atoms C- Number of molecules in 10gramd moles x NA Avogadro number NA Number ofmolecules n CrNO3)5 6.02 x1023 362 166 x1023 -66x10m olecules in 1oatoms in molesx (ato ms in GtoN, DNumber Cr No15 21X6.02 X10 6 atom = 362 - 13 2-86 X 102grams in 1o atom in 2-86 10 CrNS rams

all inoiviouals in Z Composition K BY OE Molar mas 2- of 39ghoe Molar mass ्ग Molar mass 80 gfonel T6 9imot Molar mass molar mas KBro 39 180 167RF=2319/mol 16.40 K=39 x 1o0 23) 24-63 Br 231 = 48.482 16x3 x 1 231
%K=16.88%

%Br=34.63%

%O=48.48%