4 years ago

Which temperate change indicate an increase in the average kinetic energy of the molecules in a sample?

1 answer:

8 0

An increase in temperature increases the average kinetic energy of molecules.

When the temperature of a molecule increases, the molecule starts to move at a faster rate. The faster a molecule moves, the more kinetic energy it has.

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How many molecules are in 25g of Na2SO4? POINTS!! Please help! Im so frustrated.

erik [133]

Hey there!

Molar mass Na2SO4 = <span>142.04 g/mol

Number of moles:

n = m / mm

n = 25 / 142.04

n = 0.176 moles of Na2SO4

Therefore, </span>use the Avogadro constant

1 mole Na2SO4 ------------------- 6.02x10²³ molecules
0.176 moles Na2SO4 ------------ molecules ??

0.176 x ( 6.02x10²³ ) / 1

=> 1.059x10²³ molecules of Na2SO4

hope this helps!

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4 years ago

In order to prepare very dilute solutions, a lab technician chooses to perform a series of dilutions instead of measuring a very

laiz [17]

Answerit is a

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Answer:

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