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Mariana [72]
3 years ago
9

HELP ME PLEASE 40 POINTS You may select a topic from the list below, or choose your own.

Chemistry
1 answer:
fredd [130]3 years ago
5 0

Answer:

Do black hole

Explanation:

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@ What is the wavelength of a radio wave having a frequency of 3.75 X 107 Hz?
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Answer:

8 m

Explanation:

3.0 x 10*8 divided by 3.75 x 10*7 = 8 m

6 0
2 years ago
Name the fundamental unit involved in the derived unit joule?​
tangare [24]

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Energy

Explanation:

7 0
2 years ago
Atoms of metallic elements tend to
melomori [17]

Answer:

D

Explanation:

One of the properties of metals is their abilities to form a stable compounds by losing electron(s). Metals form positive ions (cations) when they lose electron(s).

6 0
3 years ago
According to the following reaction, how many grams of nitrogen monoxide will be formed upon the complete reaction of 31.0 grams
Mumz [18]

23.227 grams of NO is formed upon the complete reaction of 31.0 grams of oxygen gas with excess ammonia.

Explanation:

The balanced chemical equation is:

4NH3 + 5O2 ⇒ 4NO + 6H20

Number of moles will be calculated.

31 grams of oxygen is given

atomic weight of oxygen gas i.e O2 = 32gm/mole

The molar mass of oxygen gas is 32 grams/mole which is equal to one mole of the molecule.

Number of moles (n) = \frac{mass}{atomic mass of one mole of the substance}

                             n=    \frac{31}{32}

                              n = 0.968 moles of oxygen are given for the reaction to occur.

From the balanced chemical equation it can be seen

5 moles of oxygen yielded 4 moles of NO

So, 0.968 moles of oxygen yield x moles of NO

\frac{4}{5} = \frac{x}{0.968 }

4 × 0.968 =5x

x = 0.774 moles of NO will be formed.

To calculate the mass of NO

mass= atomic mass x number of moles

atomic mass of NO is 30.01 grams/mole

putting the values in the formula:

mass = 30.01 x 0.774

          = 23.227 grams of NO is formed.

8 0
3 years ago
A 24.7 L sample of xenon gas is at 23ºC. What is the new temperature if the gas has a volume of 35.5 L?
Zinaida [17]

Answer:

The answer to this question is 33.8.

8 0
3 years ago
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