Consider the reaction.

2 upper c (s, graphite) plus upper h subscript 2 right arrow upper c subscript 2 upper h subscript 2 (g).

standard enthalpies of formation
substance
dhf (kj/mol)
c2 h2 (g)
226.73
caco3 (s)
–1206.92
cao (s)
–635.09
co (g)
–110.525
co2 (g)
–393.509
h 2 o (i)
–285.8
h 2 o (g)
–241.818
c (s), diamond
1.895
c (s), graphite
0.0

based on the equation and the information in the table, what is the enthalpy of the reaction?
use delta h r x n equals the sum of delta h f of all the products minus the sum of delta h f of all the reactants..

–453.46 kj
–226.73 kj
226.73 kj
453.46 kj

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

Pls! plant cells and animal cells were observed under a microscope. the characteristics of two cells are listed below. cell p: does not capture sunlight cell q: has cytoplasm but no chloroplast which statement about the two cells is correct? cell q also has a cell wall. cell q also has large vacuole. cell p also has a large vacuole. cell p also has a cell membrane.

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.