Answer:
d. There are two moles of hydroxide for each mole of these compounds.
Explanation:
calcium hydroxide, strontium hydroxide, and barium hydroxide all have two hydroxide compunds. the difference between each of these compounds is they all contain a different element along with hydroxide.
Answer:
sodium carbonate decahydrate
Explanation:
Usually we would the molar mass of Na2CO3 x 10 H2O. This is where the name comes from.
Answer:
(3) 34.5grammes of C2H6O
(4) 5.56 x 10^22 Formula units
(5) 0.5 moles of CaCO3
Explanation:
(3) molar mass of C2H6O = 24 + 6 + 16 = 46 g/mol
mass of C2H6O =0.75 mole x 46 g/mole = 34.5 grammes
(4) Formula units of NaCl = (5.4/ 58.5) x 6.022x10^23 = 5.56 x 10^22
(4) moles = mass / molar mass
molar mass of CaCO3 = 40 + 12 + 48 = 100 g/mol
moles of CaCO3 = 50/100 = 0.5 moles
Atoms are (stable) if it has (valence) electrons in its outer most energy level.
