3. Calculate the mass of Fe in 30g of FeCl; 4. Calculate the number of molecules present in 81g of H2O?
5. One mole of CaCl2 weigh how much grams?
6. Calculate the mass of sodium sulfate made when 100 g of sodium hydroxide reacts with excess sulfuric acid. (Ar of H=1. Ar of O = 16. Ar of Na= 23. Ar of S = 32) H2SO4 + 2NaOH Na SO + 2H2O 7. One mole of H. SO, weigh how much grams?
8. How many grams of NaOH will react if 3 moles of sodium hydroxide react completely to form sodium sulfate? (A. of H= 1, A, of O = 16, A, of Na = 23, A, of S = 32) H2SO4 + 2NaOH Na SO: 2H2O 9. Calculate the mass of magnesium chloride made when 96 g of magnesium reacts with excess hydrochloric acid. (As of H = 1, As of Cl = 35.5. Ar of Mg = 24) Mg (3) + 2HCl (24) MgCl2(aq) H2(g)

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates