Please help me asap this is due today, show work if possible What mass of gold would 9.03 x 10^23 particles of gold be?

What is the empirical formula & molar mass of a compound that is 40.7% carbon, 5.1% hydrogen and 54.2% oxygen ? Find the molecular formula of this compound if molecule mass is 86 g-

How many liters of gas at STP is 10 grams of Helium gas?

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

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.