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3 years ago

11

Predict the molar volume of hydrochloric acid required to produce 55 mol of hydrogen gas at STP. A) 0.045 mol/L B) 3.7 M C) 8.9

mol/L D) 15 L

1 answer:

lilavasa [31]3 years ago

7 0

Answer:

A) 0.045 mol/L

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An evaluation of R was performed, following the procedure described in this module. The barometric pressure was 736 torr, the te

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3 years ago

State the hypothesis of continental drift.

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Wegener's idea that pangaea drifted into a continents

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3 years ago

Compounds which are characterized as covalent are generally made up of elements found in which part of the periodic table

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Elements that make up the compounds that are characterized as covalent are mostly in the right part of the periodic table.

Alkalyne metals and alkalyne earth metals, which are located in the left part of the table, and given that those elements form ions with relative ease they make up ioinic compounds.

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4 years ago

What is the molar mass of a gas that fills a 1.20l container at a temperature of 305k. the gas has a mass of 1.98g and the conta

Masteriza [31]

Answer:

The molar mass of the gas should be 43.0 g/mol.

Explanation:

1.Use the ideal gas law( $PV=nRT$ ) & the formula for moles and molar mass( $n=m/M$ ).

2.Insert the equation $n=m/M$ into $PV=nRT$ and re-arrange to solve for M(molar mass). $M = mRT/PV$

3.Insert values and use the gas constant R = $0.082 (L * atm)/(K * mol)$ since the volume is in liters and the pressure is in atmosphere units.

$M = mRT/PV = \frac{(1.98g)(0.082 L*atm/(K*mol))(305 K)}{(0.960 atm)(1.20 L)}$

4. Your answer should be 42.99 g/mol or 43.0 g/mol.

Have fun with chemistry!

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2 years ago

Select all of the below statements that accurately describe the proper Lewis structure for CBr2F2.- The formal charge on each br

Yuri [45]

Answer:

There are 12 lone pairs of electrons on the molecule.

The formal charge on carbon is zero.

There are 4 covalent bonds within the molecule.

Explanation:

The formal charge(FC) can be calculated by the equation:

FC = V - N - B/2, where V is the number of the valence electrons of the neutral element, N is the number of non-bonding valence electrons, and B is the total of electrons shared in bond.

The Lewis structure is represented in the image below. F and Br have 7 valence electrons and C 4 valence electrons.

So, for C, FC = 4 - 0 - 8/2 = 0

For the both Br, FC = 7 - 6 - 2/1 = 0

For the both F, FC = 7 - 6 - 2/1 = 0

For the structure, we can see that there are 12 lone pairs of electrons on the molecule (3 in each Br and 3 in each F).

All the bonds are covalent because the atoms are sharing a pair of electrons, so there are 4 covalent bonds within the molecule.

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3 years ago