Answer: a) percent by mass = [tex]70.5\%[/tex]
b) molality = 38.01mol/kg
c) mole fraction = 0.40
Explanation:
Given molarity = 15.9 M
moles of [tex]HNO_3[/tex] = 15.9 moles in 1.00 L of solution
mass of [tex]HNO_3[/tex] = [tex]moles\times {\text {Molar mass}}=15.9mol\times 63g/mol=1001.7g[/tex]
Density of solution of = 1.42 g/ml
Volume of solution = 1.00 L = 1000 ml
Mass of solution = [tex]Density\times volume= 1.42g/ml\times 1000ml=1420g[/tex]
mass of solvent = mass of solution - mass of solute = (1420-1001.7) g = 418.3 g = 0.4183 kg
moles of solvent = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{418.3g}{18g/mol}=23.2mol[/tex]
percent by mass =[tex]\frac{\text {mass of nitric acid}}{\text {mass of solution}}\times 100=\frac{1001.2}{1420}\times 100=70.5\%[/tex]
molality = [tex]\frac{\text {no of moles of solute}}{\text {mass of solvent in kg}}=\frac{15.9mol}{0.4183kg}=38.01mol/kg[/tex]
mole fraction = [tex]\frac{\text {moles of solute}}{\text {total moles}}=\frac{15.9}{15.9+23.2}=0.40[/tex]
Which of the following pairs accurately matches the food or animal with its point of origin?
Africa: sweet potatoes, bell peppers, pineapples, turkeys
South America: cattle, goats, bananas, barley
North America: horses, pigs, wheat, sugar
Europe: potatoes, coffee, cattle, onions
Africa: chickens, peas, sheep, radishes
Answer:
Africa: chickens, peas, sheep, radishes
Explanation:
The pair which matches the food or animal with its point of origin is; Africa: chickens, peas, sheep, radishes
African origin of sheeps:Archaeological information supports separate introductions and dispersion histories for the African thin-tailed and fat-tailed sheep. The first sheep entered Africa via the Isthmus of Suez and/or the southern Sinai Peninsula, between 7500 and 7000 BP.
Additionally, chickens, peas and radishes also found their origin with Africa.
Read more on African origin animals;
https://brainly.com/question/24591420
HURRY 15 POINTS
Which of the following would you expect to determine which countries a person is able to adopt from?
race
religion
marital status
culture
Answer:
C Marital Status, because people want to know what kind of home the child is being placed into.
Explanation:
:)
Answer:
Marital Status
Explanation:
right on edge
What is your favour color
jedi master green
jedi knight blue
sith red
jedi temple guard yellow
mix dark and light purple
solo or not on either side white .
The dark Saber mandalorian .
Can someone answer my other question?. :(
Answer:
what is the question my guy
Which student is doing the best based on a number-grading system? ill a give a brainilest
The student that is doing the best is Julia because she has the highest score.
What is a number-grading system?In education, number-grading systems are systems based on numbers used to measure students' performance. There are two common systems all around the world.
1 to 10: In this system, the highest grade is 10 and the lowest grade is 1. This means a student that is given a 1 is performing poorly.1 to 5: This system is quite similar to the first system because 5, which is the highest number represents the best performance.What student is doing the best?The student that is doing the best is Julia, she got a score of 5 and therefore she is the one that has the best performance on the coursework.
Note: This question is incomplete because the options are not given; here is the missing part.
Julia, who scored a 5 on her coursework.
Samuel, who scored a 1 on his coursework.
Mariana, who scored a 3 on her coursework.
Benjamin, who scored a 4 on his coursework.
Learn more about number-grading in: https://brainly.com/question/165537
Which class is the best one to take? Also could you please explain why you chose the one that you did?
1. AP Euro
2. AP Psych
3. AP World
Answer:
AP Psych
Explanation:
In my opinion, it will take you farther in college than AP Euro or World would. You'll be suprised to find how many majors require Psychology. First, it is both a social science and biological science. If you are taking, AP bio/AP chemistry or any other science AP psych is the way to go. You go over neurotransmitters and their major functions and how relate to our behavior. I would also take this class if you have previously taken AP biology/chemistry because you will begin the class already knowing about neurotransmitters, inhibitors, and receptors. I took AP bio last year and am taking AP Psych this year and I currently have an A because I am educated on neurological functions. Even if you haven't taken bio or chemistry I would still highly suggest psychology because it prepares you for college and enhances your understanding of society and your own emotions.
True or false CIE stands for Contemporary Issues in Education.
false
Explanation:
i hope it helps u and ur troubles
Question 3 of 10
Which of these must be true for an agricultural technique to be considered
sustainable?
A. It must meet society's needs while minimizing environmental
impact.
O B. It must protect the environment at all costs.
OC. t must serve present society at the cost of future generations.
D. It must use only traditional farming practices.
Answer:
A. It must meet society's needs while minimizing environmental
impact.
Explanation:
Given that sustainability is the practice of utilizing and maintaining natural resources without causing defects to biodiversity balance.
Hence, for an agricultural technique to be considered sustainable "It must meet society's needs while minimizing environmental impact."
This implies that there should be a balance between natural resource exploitation and ecological balance, such that humans can enjoy both the resources and nature without one affecting the other and at the same time, with no negative effect on humans.
Oscar and his friends went to a movie on Thursday afternoon. They left at 1:50 P.M. It took 1 hour to drive to the theater. They arrived at the theater 55 minutes before the movie started. Once it started, the movie lasted for 1 hour and 30 minutes. What time was it when the movie ended?
HELP ASAP
Answer:
4:35
Explanation:
If the left at 1:50 and got there 1 hr later, it would be 2:50. then they arrived 55 mins. later, which would be 3:05. Then the move lasted 1 hr 30 mins long, so they left at 4:35 PM
Answer:
4:35 is when the movie ended
Explanation:
1:50 + 1 hr = 2:50. 2:50 +55 mins = 3:05. 3:05 + 1hr and 30 mins = 4:35 PM
what does blood type mean and why does it matter
a woman shoots her husband, held him underwater for 5 minutes and then they enjoy the best dinner ever, explain (riddle try your best)
i give 99 points and you give branist i did this 3 times
Answer:
thanks
Explanation:
In which of the following states would gerrymandering have the LEAST impact?
O A state in which there are a variety of ethnic groups living in each district
O A state in which there is an even split among the political party groups within the state
O A state in which 95 percent of citizens belong to the same political party
O A state in which there is a strong third-party presence
O A state in which a proportional-election system is practiced
Answer:
c
Explanation:
Answer:
A state in which 95 percent of citizens belong to the same political party
Explanation
i took the exam i got it right
What are the biological, psychological, and social-cultural factors that determine social behavior. (6 points)
Answer and Explanation:
Biological, psychological and socio-cultural factors are promoters of social behavior and although there are many controversial about their exact role in this type of behavior, we know that they are extremely influential.
In terms of biological factors, we can say that our ancestry is directly linked to the influence they have, causing us to inherit our family's social behavior, often repeating social points and positions that were passed on to us by our parents, that they received from our grandparents and so on.
Psychological factors, on the other hand, are directly related to our perception of the factors that surround us and how we shape ourselves in relation to them. In this case, we build our own influences and opinions by formulating the social behavior that we believe is ideal for us.
Finally, the socio-cultural factors show us which behaviors are acceptable and reprehensible within the society of the region in which we live. These factors present us with intrinsic concepts to all the individuals around us and are one of the most influential people that accompany us indefinitely.
Describe the process and results you used to determine the force exerted by the hockey stick on the puck.
Answer:
If you know the mass and can find the final speed of the puck, then you know how much impulse was applied to it. If you then take the known (from your video) period of time that the stick was contacting the puck, you can calculate the average force over that time.
If you want to get more sophisticated, you might be able to figure out the forces applied by looking at how the stick bends at any given instant, again from your video.
hope it helps! please mark me brainliest..
thank you!! have a good day
A study was conducted on the effects of long-term marriage (more than 10 years).
Researchers gathered data from a random sample of 4,563 adults and measured
quite a few variables, in addition to the explanatory variable of marriage and the
response variable of longer life span. According to a newspaper article summarizing
the study, those in long-term marriages were more likely to be more physically
active, at a healthy weight, and nonsmokers. Those who were not married were
about 20% more likely to be deceased. What conclusion can we draw from this
study? Explain.
D We can infer a cause-and-effect relationship because the sample was selected
randomly.
We cannot infer a cause-and-effect relationship because treatments were not
assigned randomly.
) We cannot infer a cause-and-effect relationship because we do not have a
control group.
Answer:
E
Explanation:
What’s the song by the lyrics; whoever gets them right gets brainleist. Ima do more in the future.
1. I remember years ago someone told me I should take caution when it comes to love 2. Laying in the silence waiting for the sirens signs any signs I’m alive still
3. Shooting for the stars always had a vision
4. Don't start caring about me now Don't come out Don't show up Don't start now
5. Did somebody, did somebody Break your heart? Lookin’ like an angel But
6.You know it used to be mad love So take a look what you've done 'Cause, baby,
7. No, I can't sleep until I feel your touch I said, ooh, I'm drowning in the night Oh,
8. All seem to say throw cares away Christmas is here bringing good to cheer to....
9. Was their something I could have said to make it all feel better I wish I knew you had a storm to weather so.....
10. Why u always in the mood ******* around actin brand new I ain’t trying to tell you what to do but....
what do virtually "phishing" emails have in common?
I think this answers may help you
Emily and her husband are thrilled as they peer into Emily's uterus by means of an ultrasound. The physician reports that the pregnancy appears normal and that their baby's organs, spine, and arms and legs are developing as expected. Given this information, the current stage of prenatal development is the (3 points)
embryonic period
germinal period
zygotic period
fetal stage
placenta
Answer:
A. embryonic period
Explanation:
if not then fetal stage- where the growth is furthured.
From the given information, the current stage of prenatal development is the; A: Embryonic Period
The process of prenatal development is divided into three main stages namely;
Germinal Stage; This stage is defined as the first two weeks after conception. This is the beginning stage of conception and as such it is the stage when the sperm and the egg cell unite in one fallopian tube.Embryonic Stage; This stage is from the third through the eighth week after conception. In this stage we can see the baby already developing with organs, legs, arms e.t.cFetal Period; This stage is the time frame from the ninth week after conception until the woman gives birth. This stage shows more and more changes in the brain and generally until conception time.In conclusion, the correct option for that stage of prenatal development is called Embryonic Period.
Read more about prenatal development at; https://brainly.com/question/9622335
Warmer temperatures at the Earth's poles could change atmospheric circulation and wind patterns. Propose a solution for how communities near the poles can prepare for these changes in wind.
Warmer temperatures at the poles could alter wind patterns and atmospheric circulation.
What is atmospheric circulation?Through atmospheric circulation, heat is transferred over the surface of the Earth. This has an effect on the water cycle, including cloud formation and precipitation events. The movement of air masses determines our everyday weather, and long-term patterns in circulation have an impact on regional climate and ecosystems.
This pattern, called atmospheric circulation, is a result of the Earth being heated by the Sun more at the equator than in the poles. The rotation of the Earth has an effect on it as well. In the tropics, near the equator, warm air rises.
Atmospheric circulation, or the movement of heat and air over the earth's surface, is governed by Hadley, Ferrel, and polar cells.
Thus, Warmer temperatures at the poles could alter wind patterns.
For more information about atmospheric circulation, click here:
https://brainly.com/question/788466
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A soccer ball takes 20 seconds to roll 10 meters. What is the average speed of the soccer ball?
do i ask a girl out on a date?
Answer:
Be a gentleman
Explanation:
I got a GF
Please help me with this problem. I don’t understand it.
Answer:
34
Explanation:
mid point of 0 and 3 is 1.5, -1 to 0 is 1, so the average value over that is 1.5
then 3 to 1, mid point is 2, with a lenght of 1, so 1.
midpotni of 1 and 5 is 3, over a length of 2, so 6
5 and 8 -> 6.5, length of 2 -> 13
8 and 4 -> 6, length of 1 -> 6
4 and 9 -> 6.5, length of 1 -> 6.5
add em up
1.5+1+6+13+6+6.5 = 34
