How many mols of nh4cl are present in 279.0ml of a 0.975 M nh4cl soution?

Which one of the following gases is not an important component of soil?

What is the study of how matter and energy interact? a. biology b. physics c. planetary science d. chemistry

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm