Question

find the total number of NAOH atoms in 200gm NAOH
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Answer 1

Explanation:

Step 1determine the formula of the compound that you are asked to determine the number of moles. Sodium ion is a metal in the first group in the periodic table so it will have a +1 charge (Na 1+) Hydroxide is a polyatomic that most students memorize with a -1 charge (OH 1-). So the formula for sodium hydroxide is NaOH.

Step 2: determine the formula mass of the compound looking up the atomic mass on the periodic table. Multiply the mass by the number of atoms in the formula. Na is 22.99+ O is 16.00 + H is 1.008 = 40.0 g/mol. 3 significant figures.

Step 3: divide the given mass by the formula mass. Note that the grams units cancel and the answer is in moles. 200 g / 40 g /mol =5 mol