2Ag + H2S ➞ Ag2S + H2

According to the equation for this chemical reaction, what does the 2 in front of 2Ag tell us?

What is i fracture in the crust called when land move up, down or sideways

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

Answer explain why it is not possible to deduce a complete order of reactivity.