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luda_lava [24]
3 years ago
6

What is the mole fraction of solute and the molal concentration for an aqueous solution that is 16.0% NaOH by mass?

Chemistry
1 answer:
Soloha48 [4]3 years ago
5 0
<span>let's start:

16 g NaOH has 84 g of water 
moles of NaOH =16/40
                          =0.4 
moles of water =84/18
                    = 4.667 
Total moles = 0.4+4.667
                   = 5.067 
mole fraction of NaOH = 0.4/5.067
                                     = 0.0789
Conclusion: 
84 g water will have 0.4 moles of NaOH 
1000g water will have [0.4x 1000]/84
                                  = 4.76 moles
This is called molality.
ENJOY :)

</span>
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Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
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Answer:

FeSO_{4},FeCH_{3}CO,Fe_{2}(SO_{4})_{3},Fe_{2}(CH_{3}CO)_{3}

Explanation:

Empirical formula of ionic compound formed by two ions A^{x+} and B^{y-} is A_{y}B_{x} (for x\neq y) of AB (for x = y)

The above empirical formula is in accordance with charge neutrality principle

Here each cation (Fe^{3+} and Fe^{2+}) can form two ionic compounds by combining with two given anions (SO_{4}^{2-} and CH_{3}CO^{2-}).

So the four ionic compounds are: FeSO_{4},FeCH_{3}CO,Fe_{2}(SO_{4})_{3},Fe_{2}(CH_{3}CO)_{3}

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4 years ago
What is the molar mass of 37.96 g of gas exerting a pressure of 3.29 on the walls of a 4.60 L container at 375 K?
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The molar mass of the gas is 77.20 gm/mole.

Explanation:

The data given is:

P = 3.29 atm,   V= 4.60 L   T= 375 K  mass of the gas = 37.96 grams

Using the ideal Gas Law will give the number of moles of the gas. The formula is

PV= nRT    (where R = Universal Gas Constant 0.08206 L.atm/ K mole

Also number of moles is not given so applying the formula

n= mass ÷ molar mass of one mole of the gas.

n = m ÷ x   ( x  molar mass) ( m mass given)

Now putting the values in Ideal Gas Law equation

PV = m ÷ x RT

3.29 × 4.60 = 37.96/x × 0.08206 × 375

15.134 = 1168.1241  ÷ x

15.134x = 1168.1241

x = 1168.1241 ÷ 15.13

x = 77.20 gm/mol

If all the units in the formula are put will get cancel only grams/mole will be there. Molecular weight is given by gm/mole.

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3 years ago
Can one atom in this type of reaction win the "tug of war"? What might happen if it did?
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Answer:

POLAR BONDS will form.

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Answer:

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Explanation:

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