Wine goes bad soon after opening because the ethanol dissolved in it reacts with oxygen gas to form water and aqueous acetic acid , the main ingredient in vinegar. Calculate the moles of acetic acid produced by the reaction of of oxygen. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.

1.70 mol

Explanation:

Wine goes bad soon after opening because the ethanol dissolved in it reacts with oxygen gas to form water and aqueous acetic acid, the main ingredient in vinegar. Calculate the moles of acetic acid produced by the reaction of 54.4 g of oxygen. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.

Step 1: Write the balanced equation

CH₃CH₂OH + O₂ ⇒ CH₃COOH + H₂O

Step 2: Calculate the moles corresponding to 54.4 g of O₂

The molar mass of O₂ is 32.00 g/mol.

54.4 g × 1 mol/32.00 g = 1.70 mol

Step 3: Calculate the moles of CH₃COOH produced by the reaction of 1.70 moles of O₂

The molar ratio of O₂ to CH₃COOH is 1:1. The moles of CH₃COOH produced are 1/1 × 1.70 mol = 1.70 mol.

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.