O. How many protons, neutrons and electrons are in Neodymium - 144 (Nd-144)?
a. 60. 84, 60
b. 60, 60, 60
C. 60, 144, 60
d. 84. 60. 60

You are performing an experiment in a lab to attempt a new method of producing pure elements from compounds. the only problem is that you do not know what element will form. by your previous calculations you know that you will have 6.3 moles of product. when it is complete, you weigh it and determine you have 604.4 grams. what element have you produced?

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

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