Answer:first D. 88L
Second A 2*10^24
Explanation:
At stp 1 mole = 22.4L
mw Cl2= 70.9
280 g =280/70.9 moles, about 4
4*22.4 = about 88
aw Sr 87.6 —> 6.02214076*10^23 atoms = 1 mole
(16.3 L) / (22.414 L/mol) x (4.0026 g He/mol) = 2.91 g
The correct answer is d) chrima
