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3 years ago

What would be the mass of 1.98×10^28 molecules of H2O

Chemistry

2 answers:

zloy xaker [14]3 years ago

5 0

The answer is 2035.44

antiseptic1488 [7]3 years ago

3 0

Answer: 592020g of water

Explanation:

Using Avogadro's number :

6.02 x 10^23 molecules of water has a mass of 18g

1.98 x 10 ^28 molecules of water would have a mass of: 18/ 6.02 x 10^23 x 1.98 x10^28 =592020g of water .

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A piece of brass is found to have a mass of 24.32 g. When placed in a graduated cyclinder with an initial reading of 5.60 mL the

Jobisdone [24]

Answer:

$\rho=3.1g/mL$

Explanation:

Hello,

In this case, considering that the density of a body is computed given its mass and volume:

$\rho =\frac{m}{V}$

Taking into account that the mass is 24.32 g and the volume is computed via the difference between the volume of the water with the brass and the volume of water by itself as follows:

$V=13.50mL-5.60mL=7.9mL$

The density of the piece of brass turns out:

$\rho =\frac{24.32g}{7.9mL}\\\\\rho=3.1g/mL$

Best regards.

4 0

3 years ago

Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron fallsfrom the n = 7 to the n

Helga [31]

Answer:

λ=2167.6 nm

The wavelength of light emitted is 2167.6 nm.

Explanation:

We recall that Eₙ= $\frac{-2.18*10^{-18} J}{n^{2} }$

since there was transition from n7 to n=4 we will first calculate the change in the energy i.e ΔE

ΔE=E₄-E₇

ΔE= $-2.18*10^{-18} J(\frac{1}{4^{2} } -\frac{1}{7^{2} } )$

ΔE=-9.1760*10^-20 J

Now:

|ΔE|=Energy of photon=h*v=h*c/λ

λ=h*c/|ΔE|

λ= $\frac{6.63*10^{-34}J.s*3.00*10^{8}m/s }{9.1760*10^{-20} J }$

λ=2.1676*10^-6 m

λ=2167.6*10^-9 m

λ=2167.6 nm

The wavelength of light emitted is 2167.6 nm.

5 0

3 years ago

A 4o kg skier starts at the top of a 12 meter high slope at the bottom she is traveling 10 m/s how much energy does she lose to

allsm [11]

I think the answer is b because that is true

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3 years ago

Sepuede compartir los vienes si tu mujer sefue con otro

makvit [3.9K]

Si se Casaron por vienes separdos no tienes porque compartir.

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3 years ago

3. How does this difference in language relate to our propensity to save?

stich3 [128]

Answer:

If you speak a futureless language, you will speak about time identically meaning you will feel as they are identical, it increases your propensity to save.

Explanation:

hope this helps you :)

8 0

3 years ago