What's the molality of a solution with 120 g of NaCl and 30 kg of water? A)

0.068

B)

0.004

C)

0.25

D)

6.8

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?

Avariable that is not being directly tested during an experiment should be

Stoichiometry- i need with 14 and 15! an explanation would be appreciated!