An element has an atomic number of 79. the number of protons and elections in a neutral atom of the element
a. 197 protons and 79 electrons
b. 79 protons and 0 electrons
c. 79 protons and 79 electrons
d. 79 protons and 197 electrons

What is the ph of a solution with a 1.50 × 10−9 m hydroxide ion concentration?

Acylinder is filled with 2.00 moles of nitrogen, 3.00 moles of argon and 5.00 moles of helium. if the gas mixture is at stp, what is the partial pressure of the argon

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?