A100 ml sample of propane gas is collected by water displacement. if the temperature of the water is 19 ? c and the barometric pressure reads 758 mm hg, what is the pressure of the propane in atm?

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

he would use the colour black

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg