Step 1) identify the solvent and solute
solvent= H2O
solute= NaOH
Step 2) Assume that there are 100 grams total. Assume that the percent of the compound present is the number of grams present as well
100 g total
16g NaOH
84g H20
Step 3) convert grams to moles
84g H2O =4.64 mol H2O
19 g NaOH = 0.400 mol NaOH
Step 4) mole fraction = moles A/(mol A + mol B +....)
X= 0.400/(0.400 + 4.64) = 0.079 (no units)
Step 5) convert g of solvent to kg
84 g H2O = 0.084 kg
Step 6) molality = moles of solute/ kg of solvent
molality = 0.400 mol NaOH/ 0.084 kg H2O
molality= 4.76 m
Answer:
H2SO4 + Ca(OH)2 --> CaSO4 + 2H2O
The right answer is noble gases.
The noble gases, or rare gases, are the chemical elements of group 18 (formerly "group VIIIA" or even "group 0") of the periodic table. These are helium He, neon 10Ne, argon 18Ar, krypton 36Kr, xenon 54Xe and radon 86Rn, the latter being radioactive.
This property means that they can not bind with other atoms to form molecules or lose electrons to transform into ions, hence their name noble or inert gases (they are not very active and do not do not mix). In nature, all elements "want" to become stable.
Answer:
602200000000000000000000
Explanation:
move the decimal place over 23 places to the right
