posted by Jessie .
Can someone please help me with these questions?
1 (7). Rank the following in order of increasing radius based on their positions on the periodic table: S, S-2, Cl
a. S, S-2, Cl
b. S-2, Cl, S
c. Cl, S, S-2
d. Cl, S-2, S
e. S, Cl, S-2
6 (16). Methane burns in oxygen according to the following equation:
CH4(g) + 2O2(g) „³ CO2(g) + 2H2O
What is the mass of CO2 produced when 3.4 grams O2 reacts according to the above equation?
For 1, generally the radius decreases as one moves from the left to the right in the periodic table. Adding electrons to the outer shell (as in S^-2) usually increases the size disproportionately because the electrons are repelling one another.
For #2, make sure the equation is balanced.
Convert 3.4 grams O2 to moles O2. moles = grams/molar mass.
Using the coefficients in the balanced equation, convert moles O2 to moles of CO2.
Convert moles CO2 to grams. grams = moles x molar mass.