The 2 numbers are m and n.
m + n = 7.2
m - n = 2.7Add the 2 equations and get
2m = 7.2 + 2.7 = 9.9
m = 9.9/2 = ?
Once you find m, plug its value into ether equation and get n.
Answer:
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
Answer:
Answer: E
Helen, a high school teacher, wants her students to actively participate more in class. She has decided to use reinforcement theory to get the required results. Which of the following methods is she most likely to use?
.a) She is going to call on students who never participate
.b) She is going to yell at students, telling them that they are not making good grades
.c) She is going to ask the students that always participate to allow the others to have a chance
.d) She is going to model what active participation should look like ,at the beginning of class
.e) She is going to give students extra credit each time that they contribute.
The type of statistical study that the school is conducting can be referred to as: a Prospective Observational Study.
Prospective Observational Study is a type longitudinal observational study where the research does not manipulate the research subjects but simply observe and collect data of the research subjects as their characteristics changes over time going forward.
Therefore, the type of statistical study that the school is conducting can be referred to as: a Prospective Observational Study.
Learn more about Prospective Observational Study on:
brainly.com/question/9560034
