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since the earth completes on rotation in about 24 hours.
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B) DDT resistant mosquitoes existed in the population. The presence of DDT selected for mosquitoes that survived the application. Those resistant mosquitoes reproduced with more success.
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Got the answer wrong
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Taking into account the reaction stoichiometry, the correct answer is option B): 9 grams of aluminum are necessary to produce 0.50 mol of hydrogen gas at 25°C and 1.0 atm.
Explanation:
The balanced reaccion is:
6 HCl + 2 Al → 2 AlCl₃ + 3 H₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
HCl: 6 moles
Al: 2 moles
AlCl₃: 2 moles
H₂: 3 moles
The atomic mass of aluminum is 27 g/mole. Then, by reaction stoichiometry, the following mass quantity of aluminum participates in the reaction:
Then you can apply the following rule of three: if by reaction stoichiometry 3 moles of H₂ are formed from 54 grams of Al, 0.50 moles of H₂ are formed from how much mass of Al?
mass of Al= 9 grams
In summary, the correct answer is option B): 9 grams of aluminum are necessary to produce 0.50 mol of hydrogen gas at 25°C and 1.0 atm
The probability is analyzed with the help of statistics. The probability of the person buying cereal once a month through the Venn diagram is given as, 53/64. Thus, option C is correct.
<h3>What is the Venn diagram?</h3>
A Venn diagram is the illustration of the information or the data that are in relation to other data and are represented in the form of circles.
The Venn diagram shows the total number of people who eat breakfast (A) every day, and another set shows people who buy cereals (B).
n (A) = 11 + 53 = 64
n (B) = 53 + 4 = 57
n (AB) = 53
Probability of buying cereals for the person eating breakfast every day:
= P (B/A) = P(AB) / P(A) = n(AB )/ n(A) = 53/64
Therefore, option C. 53/64 is the probability.
Learn more about the Venn diagram here:
brainly.com/question/11536075
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A challenge I experienced was at my neighbor hood, I saw this 20 dollar bill. I knew it belonged to my neighbor but I kept it but a couple weeks later I lost 56 dollars and never found it.
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