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Jlenok [28]
3 years ago
11

PLEASE ANSWER QUICKLY!

Chemistry
2 answers:
erica [24]3 years ago
7 0

Answer:

c

c

Explanation:

h3po4 + 12.81 - p40.10

prohojiy [21]3 years ago
5 0

<u>Answer:</u>

<em>A. 837 grams of H_3PO_4 are produced when 12.81 moles of water react with an excess of P_4O_{10}</em>

<em></em>

<u>Explanation:</u>

The balanced chemical equation is

P_4 O_10  + 6 H_2 O > 4 H_3 PO_4

Mole ratio of H_2 O:H_3 PO_4 is 6 : 4 or 3 : 2

As per the Equation

6 moles of water produces 4 moles of Phosphoric acid

So let us convert  

12.81 moles H_2 O to moles H_3 PO_4 by using mole ratio and then to mass H_3 PO_4 by  multiplying with molar mass H_3 PO_4

12.82 mol H_2 O \times \frac {(4mol H_3 PO_4)}{(6molH_2 O)} \times \frac {(98gH_3 PO_4)}{(1mol H_3 PO_4 )}

=837g H_3 PO_4 is produced

<u>Please note:  </u>

Molar mass is the mass of 1 mole of the substance and its unit is g/mol

We find the molar mass by adding the atomic mass of the atoms present in it.

For example H_3  PO_4 contains 3 atoms of H, 1 atom of P and 4 atoms of O

So the molar mass

=(3\times1.008)+(31\times1)+(4\times16)=98 g/mol

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Which gas will effuse at the rate closest At a particular pressure and temperature, nitrogen gas effuses at the rate of 79mLs. U
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Answer : The rate of effusion of sulfur dioxide gas is 52 mL/s.

Solution :

According to the Graham's law, the rate of effusion of gas is inversely proportional to the square root of the molar mass of gas.

R\propto \sqrt{\frac{1}{M}}

or,

(\frac{R_1}{R_2})=\sqrt{\frac{M_2}{M_1}}       ..........(1)

where,

R_1 = rate of effusion of nitrogen gas = 79mL/s

R_2 = rate of effusion of sulfur dioxide gas = ?

M_1 = molar mass of nitrogen gas  = 28 g/mole

M_2 = molar mass of sulfur dioxide gas = 64 g/mole

Now put all the given values in the above formula 1, we get:

(\frac{79mL/s}{R_2})=\sqrt{\frac{64g/mole}{28g/mole}}

R_2=52mL/s

Therefore, the rate of effusion of sulfur dioxide gas is 52 mL/s.

4 0
3 years ago
g Alkenes and alkynes are called unsaturated compounds because ________. they have fewer hydrogen atoms attached to the carbon c
Firdavs [7]

Answer:

They have fewer hydrogen atoms attached to the carbon chain than alkanes

Explanation:

Let's compare ethane (an alkane) with ethene (an alkene) and ethyne (an alkyne):

  • Ethane's formula is C₂H₄, while ethene's is C₂H₄ and ethyne's C₂H₂.

As you can see, alkenes and alkynes have fewer hydrogen atoms attached to the carbon chain due to them having multiple bonds between the carbon atoms.

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c) A substance has a high melting point and conducts electricity. What type of structure does it have
trapecia [35]

Answer:

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Explanation:

They have a high melting point due to the strong forces of attraction between the positive ions (cations) and the delocalised electrons. Moreover, they conduct electricity due to the sea of delocalised electrons.

<em>[Extra: It could be an ionic compound since they also have a high melting point, however they only conduct electricity in liquid or aqeouus state.]</em>

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Aleonysh [2.5K]

The correct ratio of the atoms of the two elements in the sample of copper chloride compound would be 1:2.

<h3>Atoms of elements</h3>

Copper chloride has a chemical formula, CuCl_2.

Thus, an atom of copper, Cu, combines with 2 atoms of chlorine, Cl.

The 2 chlorine atoms are recipients of an electron each from the copper atom which happens to have 2 electrons in its outermost valence shell.

Therefore, the ratio of copper to chlorine atoms in the compound is 1:2.

More on atoms of elements can be found here: brainly.com/question/15173445

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8 0
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