How many atoms are there in 5.10 moles of sulfur?

5.10x(6.022x10^23)=3.07x10^24(Reference: Chang 3.13)2. How many moles of calcium (Ca) atoms are there in 77.4 g of Ca?(6 points)(Reference: Chang 3.15)77.4g Ca*1 mol/40.1gCa=1.93 mol Ca3.What is the mass in grams of 1.00 × 1012lead (Pb) atoms?(8 points)1.00x10^12x207.2/6.02x10^23=3.44gx10^-10(Reference: Chang 3.19)4.Describe how you would determine the isotopic abundance of an element from itsmass spectrum.(6 points)Mass Spectrometer(Reference: Chang 3.32)5.Cinnamic alcohol is used mainly in perfumery, particularly in soaps and cosmetics.Its molecular formula is C9H10O.a.Calculate the percent composition by mass of C, H, and O in cinnamic alcohol.

Answer : option a) 84explanation :

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.