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denis23 [38]
3 years ago
8

How many neutrons does an element have if its atomic number is 40 and its mass number is 154

Chemistry
1 answer:
kramer3 years ago
4 0
I am not sure about this answer 194
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A 1.2 L weather balloon on the ground has a temperature of 25°C and is at atmospheric pressure (1.0 atm). When it rises to an el
musickatia [10]

Answer:

T_2=335.42K=62.27^oC

Explanation:

Hello,

In this case, by using the general gas law, that allows us to understand the pressure-volume-temperature relationship as shown below:

\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}

Thus, solving for the temperature at the end (considering absolute units of Kelvin), we obtain:

T_2=\frac{P_2V_2T_1}{P_1V_1}=\frac{1.8L*0.75atm*(25+273.15)K}{1.2L*1.0atm} \\\\T_2=335.42K=62.27^oC

Best regards.

4 0
3 years ago
Read 2 more answers
Bromine, a liquid at room temperature has a boiling point of 58 degrees celsius and a melting point at -7.2 degree celsius bromi
ra1l [238]

Hello!


Bromine can be classified as a pure substance.


Why?


Bromine is an element with atomic number 35 on group 17 of the Periodic Table. That's the first sign that shows us that it is a pure substance.


But the fact that it has a clear and defined boiling and melting point is a sign that we are in the presence of a pure substance. Pure substances are characterized by defined boiling and melting points.


Mixtures usually have a range of temperatures in which they melt and boil.


Have a nice day!

8 0
3 years ago
In 1953, who devopled the model that is shown below
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What model? can you screenshot it or send a link?
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3 years ago
A geological process (2 points)
densk [106]
They are all correct good job bud I hope it helps and good luck

4 0
3 years ago
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How many joules of energy is required to bring a five-pound (1 pound = 454 g) bag
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The answer is 4567 grams of ice in the five pound bag to specific heat is the -20 degrees! Hope I helped! :)
5 0
3 years ago
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