Using table provided, determine which of the following statements is true about the reaction of aluminum with oxygen gas (4 al (s) + 3 o2 (g) arrow 2 al2o3 (s)) at 25 degrees celsius and 1 atmosphere.
substance

δgf (kj/mol)

substance

δgf (kj/mol)

al2 o3

-1576.4

nacl

-384.03

h2

0.0

cl2 (g)

0.0

o2 (g)

0.0

na (s)

0.0

nh3 (g)

-16.64

na2 co3

-1048

n2 o5 (s)

118.68

no2 (g)

51.84

hcl (g)

-95.27

al (s)

0.0

the reaction produces no change in δg.

the reaction is nonspontaneous.

the reaction is spontaneous.

the reaction produces a +δg.

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices