3 years ago

Help! help! plz............

Chemistry

1 answer:

zhuklara [117]3 years ago

8 0

There the picture is the answer from the internet

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An isotope contains 16 protons 18 electrons and 16 neutrons. what is the identity of the isotope

jarptica [38.1K]

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Sulfur

Explanation:

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What is the main difference of the food pyramid and My Plate

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A property is a characteristic that can be used to identify a substance. Properties can be ______ or _______.

kirill [66]

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a list of characteristics that can be used to identify a substance include color, odor, taste, density, melting point, boiling point, conductivity, and hardness.

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Read 2 more answers

Please help ASAP!!!!!!!

SpyIntel [72]

Answer:

Chemists develop safer and more effective fertilizers and pesticides .
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Explanation:

Agriculture means food producing

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3 years ago

If He gas has an average kinetic energy of 4310 J/mol under certain conditions, what is the root mean square speed of O2 gas mol

Free_Kalibri [48]

Answer:

The root mean square speed of O2 gas molecules is

519.01 m/s

Explanation:

The root mean square velocity :

$v_{rms}=\sqrt{\frac{3RT}{M}}$

$K.E_{avg}=\frac{3}{2}RT$

$K.E =\frac{1}{2}mv_{rms}^{2}$

Molar mass , M

For He = 4 g/mol

For O2 = 2 x 16 = 32 g/mol

O2 = 32/1000 = 0.032 Kg/mol

First calculate the temperature at which the K.E of He is 4310J/mol

K.E of He =

$K.E_{avg}=\frac{3}{2}RT$

$T=\frac{2(K.E)}{3(R)}$

K.E of He = 4310 J/mol

$T=\frac{2(4310J/mol)}{3(8.314J/Kmol)}$

$T=345.60K$

Now , Use Vrms to calculate the velocity of O2

$v_{rms}=\sqrt{\frac{3(8.314J/Kmol)(345.60K)}{0.032Kg/mol}}$

$v_{rms}=\sqrt{\frac{8619.9552}{0.032}}$

$v_{rms}=\sqrt{26935.001}$

$v_{rms}=519.01m/s$

6 0

3 years ago