Please help!! 1) Find the volume of 28 g CO2 at STP? 2) Using your answer in #1 determine the density of carbon dioxide. 3) In the combustion reaction of methane gas : CH4 (g) + ( g) CO2 (g) + 2 H2O (g) 4.0 * 10 exp 23 molecules of CH4 was used. Determine (a ) the moles of CO2 produced b) using your answer in ( a), calculate the volume of CO2 produced at STP c ) the volume of oxygen used in the reaction at STP

astronomers such as edwin hubble.

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