PLEASE HELP AND ANSWER THE QUESTIONS YOU CAN A 114 g sample of ethane (C2H6) burns in excess oxygen.

2C2H6 (g) + 7O2 (g) → 4CO2 (g) + 6H2O

1 What is the theoretical yield of carbon dioxide? (6 points)
2 If 312 g is actually produced, what is the percent yield? (6 points)

Explain which group an element with the electron configuration 1s2 2s2 2p6 3s2 3p6 3d1 4s2 belongs to.

Ineed to find the answer of this question because i dont understand it

Each of the following reactions is allowed to come to equilibrium and then the volume is changed as indicated. predict the effect (shift right, shift left, or no effect) of the indicated volume change. drag the appropriate items to their respective bins.co(g) + h2o(g) < => co2(g) + h2(g) (volume is decreased) pcl3(g) + cl2(g) < => pcl5(g) (volume is increased) caco3(s)< => cao(s) + co2(g) (volume is increased)