Question

e. Assume that you have used approximately the same mass of red grease pencil and chalk to write your name and answer the following questions: i. Calculate the molar mass of the red grease pencil. (Made of wax- CasHs2) 25112.011) 75261.008) = 352,66 and almol How many moles of wax were in your name? 0.025 almal x Imal = 0.0000 7089 352.66 na (7.088 x 10 fgling iii. How many molecules of wax were in your name? 22 1 mol wax = 1,505 x 10 molecules wax 6.022 x 1023 l 10 cind formula Horny units units iv. Why were there LESS molecules of wax used than formula units of chalk? lood

Answer 1

The solution is

f) Molecular formula of coax = cas Hog . Molar mass of coax C Cassa) = 25 x 12 gimole +52% I gimole = 300g/mole + 52.416 gimole - 352.416 g/mole Molar mass = 352.416 gimole. (ii) If it took 50g of way to coolte my name i. No. of moles = Given mass Molar mass- Here given mass = 50g Molar mass = 352-416. glmole. No. of mole = 50g 352.416 9/mole hoor lui 1 mole has = 6.02 X 1023 noiy = 0.141 moles 0.141 moles is in my name in x 1023 no.of molecules mole has = 0.141 X 6.02 x 103 no. of molecules. = 0.848 x 10²3 no oy e = 8.48 x 10 no. of molecule molecule name my has = 8.48 x 1022