How many total number of all the elements present in mole of (NH4)2 Cr2O7? Thanks a lot.

All you have to do here is set up a system of two equations with two unknowns, the molar mass of $"A"$ and the molar mass of $"Z"$. Once...

First of all, we know that equal volumes of gases, at the same temperature and contain equal numbers of molecules (Avogadro's hypothesis), so the two gases above have the same...

The realization that earths were in fact oxides was attributed to Lavoisier. And the Group 2 metals form a stable series of sparingly soluble binary oxides. I am told that...

As is often the case with questions such as these, I often find that the best approach begins with a definition. Here, let's consider a typical definition of first ionisation...

This is a movement of fluid via a narrow tube or capillary tube when adhesion forces to the walls is stronger than the cohesive forces between the liquid molecules which...

If the number to be rounded off were 0.0504, the rounded off version would obviously have been 0.050. This is because, of the two possibilities here, 0.050 is closer to...

And I use $"US gallon"$ because even here in the UK we have moved away (thankfully) from the gallon as a unit of volume......(NB $"1 Imperial Gallon"-=4546*mL$). Maybe now that...

This is a limiting reactant problem. We know that we will need a balanced equation and moles of each reactant. 1. Gather all the information in one place with...

As stated, 1 mole of NaCl weighs 58.44 g. A 0.02 M solution contains 0.02 moles per liter. Hence, 1 litre would contain: 58.44 x 0.02 = 1.1688 g However,...

Mass is a measure of the number of particles. Here you have $O$ atoms, and dioxygen, $O_2$, and ozone molecules, $O_3$ but each have the same mass by specification. There...