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2 years ago

7

What is the speed of sound in dry air at 20°C?

1 answer:

Lubov Fominskaja [6]2 years ago

4 0

343 meters per second

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How many number of moles are present in 200. g of sodium bicarbonate (NaHCO3)

nikdorinn [45]

You can solve this problem through dimensional analysis.

First, find the molar mass of NaHCO3.

Na = 22.99 g

H = 1.008 g

C = 12.01 g

O (3) = 16 (3) g

Now, add them all together, you end with with the molar mass of NaHCO3.

22.99 + 1.008 + 12.01 + 16(3) = 84.008 g NaHCO3. This number means that for every mole of NaHCO3, there is 84.008 g NaHCO3. In simpler terms, 1 mole NaHCO3 = 84.008 g NaHCO3.

After finding the molar mass of sodium bicarbonate, now you can use dimensional analysis to solve for the number of moles present in 200. g of sodium bicarbonate.

$200. g NaHCO_3 * \frac{1 mole NaHCO_3}{84.008 g NaHCO_3}$

Cross out the repeating units which are g NaHCO3, and the remaining unit is mole NaHCO3

200. * 1 = 200

200/ 84.008 = 2.38

Notice how there are only 3 sig figs in the answer. This is because the given problem only gave three sig figs.

Your final answer is 2.38 mol NaHCO3.

8 0

2 years ago

(image attached) AP CHEM ACID BASE Is my answer correct? I will mark as brainliest if you answer me. I don't need an explanation

pychu [463]

Answer:

Your answer is correct based on what I remember from AP Chemistry

Explanation:

3 0

2 years ago

Consider the following types of electromagnetic radiation:

liq [111]

Explanation:

Electromagnetic wave Wavelength

(1) Microwave = 1 m to 1 mm = $10^9 nm$ to $10^6 nm$

(2) Ultraviolet = 10 nm to 400 nm

(3) Radio waves = 1 mm to 100 km = $10^6 nm$ to $10^{14}nm$

(4) Infrared = 700 nm to 1 mm

(5) X-ray = 0.01 nm to 10 nm

(6) Visible = 400 nm t0 700 nm

a) In order of increasing wavelength:

: 5 < 2 < 6 < 4 < 1 < 3

b) Frequency of the electromagnetic wave given as:

$\nu=\frac{c}{\lambda }$

$\nu$ = frequency

$\lambda$ = Wavelength

c = speed of light

$\nu \propto \frac{1}{\lambda }$

So, the increasing order of frequency:

: 3 < 1 < 4 < 6 < 2 < 5

c) Energy(E) of the electromagnetic wave is given by Planck's equation :

$E=h\nu$

$E\propto \nu$

So, the increasing order of energy:

: 3 < 1 < 4 < 6 < 2 < 5

6 0

3 years ago

1 point<br> How many moles of CO2 are there in 100.0 grams of CO2?

VikaD [51]

44.0095 you're welcome hope this helps

3 0

2 years ago

Read 2 more answers

The electron config for 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p3

nadya68 [22]

Answer:

I don't understand what you are asking

3 0

2 years ago