1. The mass of one mole of an atom or molecule is equal to the atomic mass units of one individual atom or molecule. ie. amu! g/mol. Recall also, that there are 6.02x1023atoms or molecules per mole. Use this information to convert between moles, grams, and molecules in the following. Last week we learned how to convert moles to molecules-now we will practice the reverse and a few other things...

a. How many moles are in the following?
i.6.02x1023molecules of BF3

ii.78,000,000 atoms of Ag

iii.9.24x1021grains of sand

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

The characteristics 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 an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.