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klasskru [66]
4 years ago
11

How to do this qn? help me!! ASAP

Chemistry
1 answer:
goldenfox [79]4 years ago
3 0
Steam is H2O... so there should be 3 molecule... so definitely answer A and D are wrong...as for neon... it is a single particle...so we can eliminate answer C as the black dots are in pairs... so the answer is B

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After one half life ___% of the atoms will change to a stable
Nezavi [6.7K]

Answer:

the answer is 30% if the atoms will change to a stable

3 0
3 years ago
A sample of methane gas, CH4, occupies 3.25 L at temperature of 19.0 o C. If the pressure is held constant, what will be the tem
Artemon [7]

Answer:

625.46 °C

Explanation:

We'll begin by converting 19 °C to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

T(°C) = 19 °C

T(K) = 19 °C + 273

T(K) = 292 K

Next, we shall determine the Final temperature. This can be obtained as follow:

Initial volume (V₁) = 3.25 L

Initial temperature (T₁) = 292 K

Final volume (V₂) = 10 L

Final temperature (T₂) =?

V₁/T₁ = V₂/T₂

3.25 / 292 = 10 / T₂

Cross multiply

3.25 × T₂ = 292 × 10

3.25 × T₂ = 2920

Divide both side by 3.25

T₂ = 2920 / 3.25

T₂ = 898.46 K

Finally, we shall convert 898.46 K to celsius temperature. This can be obtained as follow:

T(°C) = T(K) – 273

T(K) = 898.46 K

T(°C) = 898.46 – 273

T(°C) = 625.46 °C

Therefore the final temperature of the gas is 625.46 °C

4 0
3 years ago
How fast is the speed of light?
Tpy6a [65]

The speed of light is 299,792,458 meters per second in vacuum.
It's somewhat slower in any material substance, and different in
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(That's 186,282.4  miles per second.)


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What pressure is exerted by 0.883 mol N, in a 4.68 L steel container at 197.9 °C?
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I really hope i helped you! :)

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Answer:

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