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Mars2501 [29]
2 years ago
7

What is the weight percent of a caffeine solution made by dissolving 6.35 g of caffeine, C8H10N4O2, in 75 g of benzene, C6H6?

SAT
2 answers:
SCORPION-xisa [38]2 years ago
7 0

The weight percent is of caffiene is 7.98%.

There are several ways of expressing concentration in chemistry. One of the methods of expressing concentration is by the use of percentage.

In this case, we want to obtain the percent weight/weight concentration of caffeine in benzene.

From the question, we can see that;

Mass of solute = 6.5 g

Mass of solvent = 75 g

percent w/w = mass of solute/ mass of solute + mass of solvent × 100/1

percent weight of caffeine=

6.5/6.5 + 75 × 100/1 =7.98%

Learn more: brainly.com/question/19953404

Dvinal [7]2 years ago
4 0

Answer:

7.8g

Explanation:

6.45/(6.35+75)

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Controlling voluntary skeletal muscles is a function of the __________ nervous system. A. sympathetic B. somatic C. autonomic D.
Ierofanga [76]

Somatic nervous system performs the function of control of voluntary skeletal muscle.

The human nervous system is categorized into Central nervous system and Peripheral nervous system.

  • The central nervous system of human consists of brain and spinal cord.

  • The peripheral nervous system consist of nerves which lies outside of the central nervous system. The peripheral nervous consist of the Somatic and the Autonomic nervous systems.

  • The Somatic nervous system consist on nerves which transmits sensory & motor signals to and from the central nervous system and performs the function of voluntary control of the body movements via the use of skeletal muscles.

Learn more about Nervous system here

<em>brainly.com/question/13487019</em>

6 0
3 years ago
William julius wilson believes the cause of the emergence of an urban underclass is.
lapo4ka [179]

William Julius Wilson is known to be a popular man in history.  William Julius Wilson believes the cause of the emergence of an urban underclass is  economic and social structural deficits in society.

William Julius Wilson was known to be born December 20, 1935. He was a famous American sociologist.  He stated the importance of neighborhood effects and also showed how small employment opportunities and weakened institutional resources influenced poverty within American inner-city neighborhoods.

The underclass is known to be a collection of identifying traits, such as high rate of joblessness, single parents births etc.

See full question below

William Julius Wilson believes the cause of the emergence of an urban underclass is

a. the "culture of poverty."

b. prejudice and racism.

c. economic and social structural deficits in society.

d. too much immigration from some areas.

6 0
2 years ago
Write on the mind map the word or words that you can associate with the given words
Semenov [28]
Answer: C

Explanation: i took the testtttttttt..,
7 0
2 years ago
Find the value of z such that
Reika [66]

Answer:

z = 1.00

Explanation:

Given:

Probability of z value  = 0.6826

By using standard normal table for z value.

P(-z < Z < z) = 0.6826

P(Z < z) - P(Z < -z) = 0.6826

We know that

P(Z < z) + P(Z < -z) = 1

So,

2P(Z < z) - 1 = 0.6826

2P(Z < z) = 1 + 0.6826

2P(Z < z) = 1.6826

P(Z < z) = 1.6826 / 2

P(Z < z) = 0.8413  

So,

P(Z < 1.00) = 0.8413  

z = 1.00

5 0
3 years ago
Triangle PQR has right angle Q. If sin R = 4/5<br> what is the value of tan P?
icang [17]

By applying Pythagorean' theorem, the value of tanP is equal to 3/4.

<h3>How to determine the value of tan P?</h3>

Since triangle PQR has right-angle Q and sinR = 4/5, we have:

sinR = Opp/hyp = 4/5

tanP = Opp/Adj = QR/4

Next, we would determine the length of QR by applying Pythagorean' theorem:

PR² = QR² + PQ²

5² = QR² + 4²

25 = QR² + 16

QR² = 25 - 18

QR = √9

QR = 3 units.

For the value of tanP, we have:

tanP = 3/4.

Read more on Pythagorean theorem here: brainly.com/question/23200848

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3 0
2 years ago
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