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AURORKA [14]
3 years ago
11

How many moles of phosphoric acid are there in 658 grams of phosphoric acid?

Chemistry
1 answer:
vovangra [49]3 years ago
8 0
<span>The molecular formula for phosphoric acid is H3PO4 and has 97.994 grams per mol. In a sample of 658 grams of phosphoric acid, there are 6.71 mols of phosphoric acid.</span>
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Δs is negative for the reaction __________.
pickupchik [31]
ΔS =S(products) -S(reactants)

Where ΔS is the change of  entropy in a reactions

a. ΔS = (2) - (2+1) = -1
b. ΔS = (1+1) -(1) = 1
c. ΔS = (1+2) - (1) = 2
d. ΔS = (2) - (2+1) = -1
e. ΔS = (1) - (1) = 0

ΔS is negative for reaction a. and d.
6 0
3 years ago
Explain why sodium chloride solution cannot be used as the electrolyte to produce
ira [324]

Explanation:

Because the solution only contains Na+ and Cl− ions, and water, and not the metal Na(s) . You cannot evaporate the water from the solution and hope to obtain anything but NaCl(s) .

.

Na(s) has an electron configuration of 1s^2 2s^2 2p^6 3s^1 , but Na+(aq) has an electron configuration of 1s^2 2s^2 2p^6 . That means they are not the same element, and thus, there is no straightforward way of extracting Na(s) from a NaCl (aq) solution

6 0
2 years ago
Because the the individual components of any mixture are not _____ to each other, the composition of those components can vary.
Alla [95]

Answer:

<em>Because the individual components of any mixture are not</em> <u>bonded</u> t<em>o each other, the composition of those components can vary. Also, some of the </em><u>physical</u> <em>properties of the individual components are still noticeable.</em>

Explanation:

A <em>mixture</em> is a combination of two or more pure substances that are present in any proportion and each pure substance keeps its own physical and chemical properties.

As oppossite to mixtures, the compounds are pure substances formed by two or more different elements which are chemically bonded to each other. So, while in the compounds the components (elements) are bonded in a fixed proportion, and their composition cannot vary, in the mixtures each component may be present in any proportion, which means that the <em>composition can vary</em>.

Take, for example, the simple case of talc and iron particles.This is <em>a mixture</em>. Talc is <u><em>not bonded</em></u> to the iron particles, and so their proportion, <em>the compositoin</em>, can vary in any form. Aslo, both talc and iron particles keep their own <u><em>physical properties</em></u>: you can perfectly separate the mixture by using a magnet to attract the iron particles, because they have not lost their magnetic property (a physical one).

4 0
3 years ago
I need help on either question you can answer. Thank you god bless
Stels [109]
<h3>Further explanation</h3>

1.Atomic Number (Z) = Mass Number (A) - Number of Neutrons

neutrons = mass number-atomic number

Atomic mass Cl-37= 17

Mass number Cl-37=37

Neutrons = 37-17=20

2. Mass atom X = mass isotope 1 . % + mass isotope 2.%...

\tt atomic~mass~X=0.0224\times 88+0.7832\times 90+0.1944\times 91=90.1

3. The energy in one photon can be formulated as

\large{\boxed{\bold{E\:=\:h\:.\:f}}}

f = c / λ, so :

\tt E\approx f\approx \dfrac{1}{\lambda}

Energy is directly proportional to frequency and inversely proportional to the wavelength

So, as the frequency of photon increases, the energy of photon increases

4. Based on answer number 3 :

A. The wavelength becomes longer, and the energy decreases

7 0
3 years ago
What happens when an electron absorbs energy?
OLga [1]
The correct answer is A I believe
4 0
3 years ago
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