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ser-zykov [4K]
3 years ago
7

How many atoms are present in 2g of hydrogen gas​

Chemistry
1 answer:
RSB [31]3 years ago
4 0

Answer:

2 because if you look on the periodic table the number of the element tells you how many atoms is in it

Explanation:

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When a substance gains or loses energy, it’s _____ changes, or its _____ chafes. Theses two changes do ___happen at the time ; t
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Answer:

When a substance gains or loses energy, its <u>temperature</u> or <u>state</u> changes. These two changes do <u>not</u> happen with respect to time; the temperature remains <u>the same</u> until the change of <u>state</u> is complete.

Explanation:

This statement is about energy and change of the state of the matter. By gaining or losing energy, the physical state of the matter can change into one another. Melting, freezing, condensation, evaporation, sublimation, and deposition are the processes that support to change the physical state of the matter. Change in state and change in the matter do not happen at the same time. A substance gains or loses energy to reach a specific temperature and remains constant until the physical change of matter is completed.

3 0
3 years ago
A rigid 3.80 L sealed vessel contains 0.650 mol Ne, 0.321 mol Kr, and 0.190 mol Xe. Find the density of the mixture in g/L.
Eddi Din [679]

Answer:

17.09g/L

Explanation:

Density = total mass of elements/ volume

We need to find the mass of each mixture constituents using their molar mass:

mole = mass/molar mass

For Neon (Ne) which contains 0.650mol;

0.650 = mass/20.18

mass = 0.650 × 20.18

mass = 13.12g

For Krypton (Kr) which contains 0.321mol;

0.321 = mass/83.79

mass = 0.321 × 83.79

mass = 26.89g

For Xenon (Xe) which contains 0.190mol;

0.190 = mass/131.3

mass = 0.190 × 131.3

mass = 24.95g

Total mass = 13.12g + 26.89g + 24.95g = 64.96g

Density = total mass / volume

Density = 64.96g / 3.80L

Density of the mixture = 17.09g/L

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If you observe a liquid turning into gas at 135 degrees Celsius what are you observing?
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The zinc within a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (s
Nonamiya [84]

Answer: 0.0746 grams of hydrogen

Explanation:

To calculate the mass of hydrogen :

(Vapor pressure of water is 23.78 mmHg at 25 ∘C )

2H^+(aq)+Zn(s)\rightarrow H_2(g)+Zn^{2+}(aq)

According to avogadro's law, 1 mole of every substance occupies 22.4 L at NTP, weighs equal to the molecular mass and contains avogadro's number 6.023\times 10^{23} of particles.

According to the ideal gas equation:

PV=nRT

P = Total Pressure = 752 mm Hg

pressure of hydrogen = Total Pressure - Vapor pressure of water =  (752 -23.78 )mm Hg = 728.22 mm Hg =  0.958 atm   (760mmHg=1atm)

V= Volume of the gas = 0.953 L

T= Temperature of the gas = 25°C = 298 K  

R= Gas constant = 0.0821 atmL/K mol

n= moles of gas= ?

n=\frac{PV}{RT}=\frac{0.958\times 0.953}0.0821\times 298}=0.0373moles

Mass of H_2=moles\tims {\text {molar mass}}=0.0373mol\times 22g/mol=0.0746g

Thus 0.0746 grams of hydrogen is collected.

7 0
3 years ago
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