A 90.00 g sample of Na₂CO₃*xH₂O is heated until all of the water is driven off, forming 32.28 g of the anhydrous salt, Na₂CO₃. What is the percent by mass of H₂O in the hydrated compound, Na₂CO₃*xH₂O? A) 14.53% H₂O
B) 37.03% H₂O
C) 64.13% H₂O
D) 68.85% H₂O

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°