Calculate the number of moles in 41.5 g of MgCl2

If a student performs an exothermic reaction in a calorimeter, how does the calculated value of ΔH (Hcalc) differ from the actual value (Hactual) if the heat exchanged with the calorimeter is not taken into account?

What type of coal contains the least amount of carbon? ( a. lignite ( b. peat ( c. anthracite?

During an experiment, Stephanie found 4.5 mg of iron in a 750 g water sample. How many parts per million of iron are in the water sample?

Write the full symbol for the isotope of oxygen having 8 neutrons.

How do scientists determine the number of neutrons in an isotope of an atom? A. They find the number of protons. B. They divide the atomic mass by two. C. They add the number of electrons and protons. D.

A horizontal row of elements in the periodic table is known as a group or period

When forces attracting solvent particles to each other are broken, what is provided for a solution? energy for the solute to precipitate space for the solute in the solvent inertia for the solute to move into the solvent nothing is provided

What occurs when a magnesium atom becomes a magnesium ion?

Two electrons are shared equally in bromine. what type of bond is represented between the bromine atoms in this Lewis structure

6. A gas mixture has partial pressure of 120 torr N2, 350 torr Ar, and 480 torr SF6. What is the mole fraction of sulfur hexafluoride in the mixture?