if you start with 0.572g of unknown hydrate and end with 0.498g of anhydrous compound ,what is the percentage of water by mass in the sample?

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

What is the molar mass of a gas that has density of 2.054 g/l

27 drag each label to the correct location on the image. a particular exosolar system has five planets in total: a, b, c, d, and e. the table lists the orbital periods of these planets in days. planet orbital period (days) a 600 b 80 c 1,000 d 500 e 100 move each planet to its orbit in the system.