Answer:
This means a sample of 73.2 grams As atoms weighs less than the same amount of Kr atoms
Explanation:
Step 1: Data given
Mass of As = 73.2 grams
Molar mass As = 74.92 g/mol
Molar mass of Kr = 83.80 g/mol
Step 2: Calculate moles As
Moles As = Mass As / molar mass As
Moles As = 73.2 grams . 74.92 g/mol
Moles As = 0.977 moles
Step 3: Calculate As atoms
As atoms = moles As * number of Avogadro
As atoms = 0.977 moles * 6.02 * 10^23
As atoms = 5.88 *10^23 As atoms
Step 4: Calculate moles Kr
Moles Kr = Atoms Kr / number of Avogadro
Moles Kr = 5.88 * 10^23 Kr atoms / 6.02 *10^23
Moles Kr = 0.977 moles
Step 5: Calculate mass Kr
Mass Kr = moles Kr * molar mass Kr
Mass Kr = 0.977 moles * 83.80 g/mol
Mass Kr = 81.9 grams
This means a sample of 73.2 grams As atoms weighs less than the same amount of Kr atoms
