Gas occupies 30 Liters at 2.0 atm pressure and 27° Celsius. How many moles of gas are present

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

How are evaporation and sublimation similar? a both involve the formation of a gas. b both release energy to the surroundings. c both take place throughout a solid. d both take place at the surface of a liquid.

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided