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2 years ago

Please answer as fast as you can

Chemistry

2 answers:

ki77a [65]2 years ago

7 0

Answer:

Probably answer D.

Explanation:

It makes the most sense because it's just changing the temp of the water

Elan Coil [88]2 years ago

6 0

D, no harmful chemicals were added to the water.

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3 years ago

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What volume of 1.25 M solution is needed to make 250 mL of 0.75 M solution?

zysi [14]

Answer:

V1= 150ml

Explanation:

C1= 1.25, V1=?, C2= 0.75, V2= 250ml

Applying dilution formula

C1V1= C2V2

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3 years ago

If a liquid spontaneously turns into a gas below the critical temperature, it has evaporated.

VMariaS [17]

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3 years ago

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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 = 142.04 g/mol

Number of moles:

n = m / mm

n = 25 / 142.04

n = 0.176 moles of Na2SO4

Therefore, 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!

6 0

4 years ago

PLEASE HELP!!!!!!

jeyben [28]

Answer: The correct option is 1 mole of acetic acid was required for 2 moles of sodium bicarbonate

Explanation:

We are given:

Average number of drops of sodium bicarbonate = 142

The chemical equation for the reaction of sodium bicarbonate and acetic acid in vinegar follows:

$NaHCO_3+CH_3COOH\rightarrow CH_3COONa+H_2CO_3$

From the stoichiometry of the reaction:

1 mole of sodium carbonate reacts with 1 mole of acetic acid in vinegar.

Hence, the correct option is 1 mole of acetic acid was required for 2 moles of sodium bicarbonate

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3 years ago