What is the pressure in atmospheres of a 0.108mol sample of he gas at a temperature of 20.0°c if its volume is 0.505l?
a. 5 atm
c. 5.1 atm
b. 4.86 atm
d. 5.14 atm

Iron reacts with sulfur to form iron sulfide. if 60 grams of iron reacts with sulfur to produce 90 grams of iron sulfide, how much sulfur has been used in the chemical reaction?

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

Positive ions differ from neutral atoms in that