A student weighed 100g of salt hydrate (salt. x H2O). When heated 30.6g of water was evaporated. (The molar mass of the anhydrous salt is 245g/mol and the molar mass of water 18g/mol). How many moles of water are evaporated?
Calculate the moles of anhydrous salt.
What is the ratio (x) of moles of water to the moles of the anhydrous?
What is the formula of the salt?

How much energy is made when a pice of wood burns. how do you know

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.