Question

How many atoms of hydrogen are in 46g of CH₄O?

Answer 1

To find the atoms of hydrogen Given that 46g of CH 0 First find the moles of CHO moles =_mass molarm ass Calculate the molarmass of CHO The atomic masses of atoms in the given from periodic table C(Carbon) = 12.018 H(Hydrogen) = 1.008g 0(Oxygen) = 16 g Add the atomic masses of all of the atoms in the molecule 12.01+1.008x4+16= 32.042g/mol 46g moles = 32.042g/mol = 1.435moles find the moles of hydrogen 1mole of CH.Ogives 4 moles of hydrogen Therefore moles of hydrogen =1.435 x 4 moles = 5.74 moles To find the atoms of hydrogen Avogadro's constant says that Imole of any atom contains 6.022x10" atoms 1 mole = 6.022x10 - atoms So 5.74moles of hydrogen = 5.74x6.022x102 atoms = 3.45x10 atoms Hence the atoms of hydrogen = 3.45x1024 atoms