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balandron [24]
3 years ago
10

Help me pls brainliest goes to first to answer

Chemistry
2 answers:
postnew [5]3 years ago
6 0
Answer: b has are higher solubility than a
iris [78.8K]3 years ago
3 0

Answer:

Answer: The solubility of B is high than the solubility of A.  

Explanation:

The solubility is defined as the amount of substance dissolved in a given amount of solvent. More the solute gets dissolved, high will be the solubility and less the solute dissolved, low will be the solubility.  

Mass of undissolved substance of substance A is more than Substance B at every temperature. This implies that less amount of solute gets dissolved in the given amount of solvent.

Therefore, B has high solubility than substance A.

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How many moles is 17.6 g NaOH?
Lynna [10]

Answer:

\boxed {\boxed {\sf D. 0.440 \ mol \ NaOH}}

Explanation:

To convert from moles to grams, the molar mass is used (mass of 1 mole). The values are the same as the atomic masses on the Periodic Table, but the units are grams per mole (g/mol) instead of atomic mass units.

<h3>1. Molar Mass</h3>

We are given the compound sodium hydroxide (NaOH) and we need to look up the molar masses of the individual elements.

  • Na:  22.9897693 g/mol
  • O: 15.999 g/mol
  • H: 1.008 g/mol

The formula for the compound has no subscripts, so there is 1 mole of each element in 1 mole of the substance. We can simply add the molar masses.

  • NaOH: 22.9897693 + 15.999 + 1.008 = 39.9967693 g/mol

This means there are 39.9967693 grams of sodium hydroxide in 1 mole.

<h3>2. Convert Grams to Moles </h3>

Use the molar mass we found as a ratio.

\frac {39.9967693 \ g \ NaOH}{ 1 \ mol \ NaOH}

Since we are converting 17.6 grams of NaOH to moles, we multiply by this value.

17.6 \ g\ NaOH *\frac {39.9967693 \ g \ NaOH}{ 1 \ mol \ NaOH}

Flip the ratio so the units of grams of NaOH cancel.

17.6 \ g\ NaOH *\frac {1 \ mol \ NaOH}{ 39.9967693 \ g \ NaOH}

17.6 *\frac {1 \ mol \ NaOH}{ 39.9967693}

\frac{17.6 }{ 39.9967693} \ mol \ NaOH

0.4400355406 \ mol \ NaOH

<h3>3. Round </h3>

The original measurement of grams has 3 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place.

  • 0.4400355406

The 0 in the ten thousandths place (in bold above) tells us to leave the 0 in the thousandth place.

0.440 \ mol \ NaOH

17.6 grams of sodium hydroxide are equal to <u>0.440 moles of sodium hydroxide.</u>

3 0
2 years ago
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Answer:

#1 is protons electrons and neutrons

their respective parts are center, positive ,and no charge

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#3 is the number of protons, characteristics, same

#4 is atomic mass, average atomic mass

#5 is mass number, nucleus

Explanation:

no need to say thank tou i know ur in class

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