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4 years ago

PLZ help me

Chemistry

1 answer:

Alona [7]4 years ago

5 0

Answer:

Wavelength in high frequency waves:

Wavelength. Waves of blue light have a shorter wavelength than waves of red light. The frequency of a wave is inversely proportional to its wavelength. That means that waves with a high frequency have a short wavelength, while waves with a low frequency have a longer wavelength.

Wavelength in low frequency waves:

The frequency of a wave is inversely proportional to its wavelength. That means that waves with a high frequency have a short wavelength, while waves with a low frequency have a longer wavelength. Light waves have very, very short wavelengths.

Explanation:

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An organic acid is composed of carbon (68.84%), hydrogen (4.96%), and oxygen (26.20%). Its molar mass is 122.12 g/mol. Determine

nekit [7.7K]

Answer:

The molecular formula of the compound is $C_{7}H_{6}O_{2}$ .

Explanation:

Let consider that given percentages are mass percentages, so that mass of each element are determined by multiplying molar massof the organic acid by respective proportion. That is:

Carbon

$m_{C} = \frac{68.84}{100}\times \left(122.12\,\frac{g}{mol} \right)$

$m_{C} = 84.067\,g$

Hydrogen

$m_{H} = \frac{4.96}{100}\times \left(122.12\,\frac{g}{mol} \right)$

$m_{H} = 6.057\,g$

Oxygen

$m_{O} = \frac{26.20}{100}\times \left(122.12\,\frac{g}{mol} \right)$

$m_{O} = 31.995\,g$

Now, the number of moles ( $n$ ), measured in moles, of each element are calculated by the following expression:

$n = \frac{m}{M}$

Where:

$m$ - Mass of the element, measured in grams.

$M$ - Molar mass of the element, measured in grams per mol.

Carbon ( $m_{C} = 84.067\,g$ , $M_{C} = 12.011\,\frac{g}{mol}$ )

$n = \frac{84.067\,g}{12.011\,\frac{g}{mol} }$

$n = 7$

Hydrogen ( $m_{H} = 6.057\,g$ , $M_{H} = 1.008\,\frac{g}{mol}$ )

$n = \frac{6.057\,g}{1.008\,\frac{g}{mol} }$

$n = 6$

Oxygen ( $m_{O} = 31.995\,g$ , $M_{O} = 15.999\,\frac{g}{mol}$ )

$n = \frac{31.995\,g}{15.999\,\frac{g}{mol} }$

$n = 2$

For each mole of organic acid, there are 7 moles of carbon, 6 moles of hydrogen and 2 moles of oxygen. Hence, the molecular formula of the compound is:

$C_{7}H_{6}O_{2}$

8 0

3 years ago

AVERAGE WEIGHT OF CHILDREN, AGE 1-5

aalyn [17]

The most weight was gained between 0 - 1 years for both boys and girls.

<h3>What is weight?</h3>

Weight is a vector quantity that varies from place to place to due to effect of gravity.

Average weight of the boys in pounds;

age -------------------- average weight

0 -------------------------50

1 ------------------------- 45

2 ------------------------ 40

3 ------------------------- 35

4 -------------------------- 30

5 -------------------------- 25

Average weight of the girls in pounds;

0 --------------------------------- 20

1 ----------------------------------- 15

2 ------------------------------------ 10

3 --------------------------------------5

4 -------------------------------------- 0

5 --------------------------------------- 1

The most weight was gained between 0 - 1 years for both boys and girls.

Learn more about average weight here: brainly.com/question/24889549

5 0

3 years ago

An object starts from rest and exhibits the motion represented by the graph. The object’s average velocity during the 3 second t

Rufina [12.5K]

Answer:

8.4 m/s

Explanation:

Initial velocity of the object is 0 as it was at rest.

We need to find the object’s average velocity during the 3 second to 5 second.

We can see from the graph that from 3 s to 5 s, the graph is a straight line. If we take the slope we can find the average velocity during the 3 second to 5 second.

Displacement between 3 s to 5 s is :

D = 24.8 m - 8 m = 16.8 m

Time = 5 s - 3 s = 2 s

Now,

Average velocity,

$v=\dfrac{\Delta y}{\Delta x}\\\\y=\dfrac{16.8\ m}{2\ m}\\\\y=8.4\ m$

So, the object’s average velocity during the 3 second to 5 second is 8.4 m/s.

3 0

3 years ago

. Which of the following statement is false?

nikklg [1K]

Answer:

Explanation:

7 0

3 years ago

Read 2 more answers

Which of the following is the smallest volume? 500 mL 2,500 cm3 5.5 x 10-1 L 25 m3

Anni [7]

500 ml is the answer

6 0

4 years ago