How to determine the number of valence electrons?

What is the formula mass of calcium sulfate dihydrate [CaSO4⋅2H2O]? Be sure to add the water of hydration, which is the 2H2O part (water surrounding the calcium sulfate). 136 g/mol 154 g/mol 164 g/mol 172 g/mol 172 is correct

If 15.6 g of hydrate are heated and only 11.7 g of anhydrous salt remain, calculate the % of water lost.

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable

How does the processes of photosynthesis and cellular respiration allow for the flow of energy in organisms

The following reaction is at equilibrium. What would be the effect of adding an excess of N2 and O2? N2 + O2 ↔ 2NO Question 16 options: The equilibrium will shift to the right. The equilibrium will shift to the left. Less product will be produced.

What is the molality of a solution containing 4.0 moles of solute in 3.2 kg of solvent? Round to the nearest tenth. Don't forget the units.

What is the name of a binary compound made up of lithium and chlorine?

A scientist in London and a scientist in California both conducted independent investigations that produced similar results.

When magnesium combines with oxygen, the reaction involves a. a conversion of protons into electrons. b. sharing of electrons between Mg and O. c. transfer of electrons from Mg to O. d. transfer of electrons from O to Mg.

The activation energy for the reaction no2 (g) + co (g) ⟶no (g) + co2 (g) is ea = 100 kj/mol and the change in enthalpy for the reaction is δh = - 375 kj/mol.