why would a guy date me for 2 month then when i break up with him because i dont think he likes me anymore he gets with my best friends not even two weeks later

Which of these is an intensive property of a substance

How much would the freezing point of water decrease if 4 mol of nacl were added to 1 kg of water (kf=1.86 degrees c/(mol/kg) for water and i=2 for nacl a- 7.44 degrees c b- 14.88 c 3.72 d 1.86

How many moles are present in 10.5 grams of nacl?