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3 years ago

Air is made up of what percentage of each type of molecule?

Chemistry

1 answer:

malfutka [58]3 years ago

4 0

Answer:

78% nitrogen, 21% oxygen and about 1 percent argon

Explanation:

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In general the human ear is most sensitive to sounds at 2500 hz. Assuming that sound moves at 330m/s what is the wavelength of s

elena-s [515]

Answer:

0.132 meters is the wavelength of sounds to which people are most sensitive.

Explanation:

Frequency of the sound human ears are most sensitive to = $\nu = 2500Hz=2500 s^{-1}$

Speed of the sound wave = S = 330 m/s

Wavelength of the sound human ears are most sensitive to = $\lambda = ?$

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

$2500 s^{-1}=\frac{330 m/s}{\lambda }$

$\lambda =\frac{330 m/s}{2500 s^{-1}}=0.132 m$

0.132 meters is the wavelength of sounds to which people are most sensitive.

3 0

3 years ago

I have a buddy who recycles electronics, and isolates metals from the connector pins electrical boards. He isolates gold, for ex

bogdanovich [222]

Solution :

In the process to isolate gold that has a 80 percent yield, a 3.00 g of Au is being isolated.

That is, the actual yield of Au is 3. 00 g

Therefore, we need to find the theoretical yield.

As we know,

$\text{percent yield}=\frac{\text{actual yield}}{\text{theoretical yield}} \times 100$

$\text{theoretical yield}=\frac{\text{actual yield}}{\text{present yield}} \times 100$

As actual yield = 3.00 g

percent yield = 80 %

So, theoretical yield = $\frac{3.00}{80} \times 100$

= 3.75 g

Thus he should be able to get 3.75 g which is the theoretical yield of Au.

5 0

3 years ago

PLEASE HELP WITH ALL! Do the following Mole conversions:

ExtremeBDS [4]

Answer:

The answer to your question is below

Explanation:

1) number of molecules = x

23 g of CoCl₂

Molar mass CoCl₂ = 59 + 71 = 130 g

130 g ------------------ 6.023 x 10²³ molecules

23 g ----------------- x

x = (23 x 6.023 x 10²³) / 130

x = 1.066 x 10²³ molecules

3.2 moles of H₃PO₄ to grams

Molar mass = 3 + 31 + (16 x 4)

= 98 g

98 g ------------------- 1 mol

x ------------------- 3.2 moles

x = (3.2 x 98)/1

x = 313.6 g

2.2 moles of (NH₄)₂ to grams

Molar mass = (14 x 2) + (8 x 1)

= 36 g

36 g of (NH₄)₂ ---------------- 1 mol

x ---------------- 2.2 moles

x = (2.2 x 36)/1

x = 79.2 grams

Molecules = ? 4.5 g of NH₄SO₂

Molar mass = 14 + 32 + 32 + 4

= 82 g

82 g of NH₄SO₂ --------------- 6.023 x 10²³ molecules

4.5 g ---------------- x

x = (4.5 x 6.023 x 10²³) / 82

x = 3.3 x 10²³ molecules

Liters of N₂ = ? 7.9 x 10³⁰ particles

22.4 l --------------------- 6.023 x 10²³ particles

x -------------------- 7.9 x 10³⁰

x = (7.9 x 10³⁰ x 22.4) / 6.023 x 10²³

x = 2.93 x 10⁸ particles

7 0

3 years ago

What does bacteria cell and plant cell have in common

Natasha_Volkova [10]

Answer:

They both have a cell wall

Explanation:

7 0

3 years ago

What is it called when water drops form something

GarryVolchara [31]

It is the gravitational force pulling on something

4 0

4 years ago