Answer:
a) 5.40 g B : atoms
b) 0.250 mol K : atoms
c) 0.0384 mol K : atoms
d) 0.02550 g Pt: atoms
e) Au: atoms
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.
To calculate the moles, we use the equation:
a) 5.40 g B
1 mole of boron contains = atoms
Thus 0.5 moles of boron contain = atoms
b) 0.250 mol K
1 mole of potassium (K) contains = atoms
Thus 0.250 moles of potassium contain = atoms
c) 0.0384 mol K
1 mole of potassium (K) contains = atoms
Thus 0.0384 moles of potassium (K) contain = atoms
d) 0.02550 g Pt
1 mole of platinum contains = atoms
Thus of platinum contain= atoms
e) Au,
1 mole of gold contains = atoms
Thus of platinum contain= atoms