In a double replacement reaction, how many grams of calcium chloride are needed to react with excess sodium phosphate to produce 2.009 x 10^22 formula units of the precipitate?

An experimental procedure requires a 10 ml of acid to be dissolved

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.

An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.