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7nadin3 [17]
3 years ago
9

PLEASE HELP ME ASAP!! How many molecules are in 7.5 grams of Oxygen gas?

Chemistry
1 answer:
Juli2301 [7.4K]3 years ago
4 0
It is about 6 x 10^23. So in 5 moles of oxygen gas, which has a mass of 5x16=80 grams, there are 5x6x10^23 = 30x10^23 molecules.
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The density of mercury (the element) is 13.69 g/cm3. The density of Mercury (the planet) is 5.43 g/cm3. If Mercury (the planet)
Annette [7]

Answer:

The diameter of Mercury would be 0.735 times smaller than the actual diameter i.e., it would become 3590 km from 4879 km

Explanation:

For the sake of simplicity, let us consider Mercury spherical and uniform. The provided data shows that if the Mercury planet is purely composed of mercury then it will require less space as compared to the actual planet, due to the higher density of the mercury. The ratio of the two densities shows that the volume of Mercury would reduce 2.52 times. From the change in volume we can determine the change in diameter by taking the ratio of initial and final states, shown in the following derivation:

V=(\frac{4}{3})(\pi )(r^{3}),

Here, V is the volume and r is the radius of the Mercury.

From the ratio of initial and final states, we obtain the following relation

\frac{V_{2} }{V_{1} } = \frac{r_{2} ^{3}}{r_{1} ^{3}}

as,

V_{2}=\frac{V_{1}}{2.52}

so,

\frac{1}{2.52} = \frac{r_{2} ^{3}}{r_{1} ^{3}}

r_{2}^{3}=\frac{r_{1}^{3}}{2.52}

r_{2}=  0.735.r_{1}

The factor will remain same for the diameter i.e.,

D_{2}= 0.735 D_{1}

For absolute diameter of Mercury:

Actual diameter of Mercury = 4879.4 km

Hence, the diameter of Mercury, if it was made of mercury would become 3590 km.

P.S.: The element mercury first letter is kept small while the other is capped

5 0
3 years ago
10. The molar mass of an unknown gas was measured by an effusion experiment. It was found that it took 63 s for the gas to effus
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Answer:

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Explanation:

4 0
3 years ago
Identify the element that cannot participate in nuclear fission reactions. (Hint: Think about the size of the atom.)
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How many atoms are there in 1 g of argon?
amm1812

Answer:

1.5057×10^22 atom

Explanation:

As we

1 mole of argon = 40 g of argon

i.e 40 g of argon = 1 mole of argon

1 g of argon = 1/40 mole of argon

1 mole of argon = 6.023×10^23 atom of argon

1/40 mole if argon = 1/40 ×6.023×10^23

= 1.5057×10^22

7 0
2 years ago
Which statement about atoms is correct
lesya [120]

Answer:Protons are positively charged is the correct statement about an atom

I've also corrected the other statements

Atoms contain protons and neutrons in their nucleus

Neutrons posses no charge and are neutral

The nucleon number is the total number of protons and neutrons in a nucleus

6 0
3 years ago
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