Tutored Practice Problem 3.1.3 COUNTS TOWARDS GRADE Convert between mass, moles,

Question

Tutored Practice Problem 3.1.3 COUNTS TOWARDS GRADE Convert between mass, moles, and atoms of an element. How many Co atoms are there in a 37.9 gram sample of elemental Co? atoms Show Approach The molar mass of a compound is the mass in grams of one mole of the compound. It is numerically equal to the compou molecular) weight. Formula weight is the sum of the atomic weights of the elements that make up a substance multiplie atoms of each element in the formula for the substance. For substances that exist as individual molecules, the formula we molecular weight For example, one molecule of water, H2O, is made up of two hydrogen atoms and one oxygen atom 1 mol of H 0 molecules the molar mass of H,O is equal to the mass of2 mol of hydrogen atoms plus the mass of 1 m molar mass H O-(2 mol +1 mol o) ( 40.008

Explanation / Answer

Number of mole = amount in g / molar mass

= 37.9 g/ 58.93 g/mole

=0.643 moles

1 mole = 6.022*10^23 atoms / mole

0.643 moles * 6.022*10^23 atoms / mole

=3.87*10^23 atoms Co

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