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Oduvanchick [21]

3 years ago

10

A hypothetical main group element E reacts with chlorine to form an ionic compound with the formula ECl. The element is a member

of what group in the periodic table.
1A, 6A, 2A, 3A, or 7A?

1 answer:

Ronch [10]3 years ago

7 0

It would be 1A bc then the +1 charge will cancel out chlorine’s -1 charge

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The mass number refers to the totaol number of _____and_____which can be found int he nucleus of the atom

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The mass number refers to the total number of protons and neutrons which can be found in the nucleus of the atom.

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What is the molarity of a solution in which 0.321 g of calcium chloride is dissolved in 1.45 L water?

lana66690 [7]

Answer:

Molarity = 0.002 M

Explanation:

Given data:

Mass of calcium chloride = 0.321 g

Volume of water = 1.45 L

Molarity of solution = ?

Solution:

Molarity = number of moles / volume in litter.

We will calculate the number of moles of calcium chloride first.

Number of moles = mass/molar mass

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Molarity:

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How many molecules of CH4 are in 48.2 g of this compound? A) 2.00 x 1023 B) 5.00 x 10-24 C)1.81 x 1024 D) 4.00 E) 4.64 x 1026 10

Tasya [4]

<u>Answer:</u> The correct answer is Option C.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

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Given mass of methane = 48.2 g

Molar mass of methane = 16 g/mol

Putting values in above equation, we get:

$\text{Moles of }CH_4=\frac{48.2g}{16g/mol}=3.0125mol$

According to mole concept:

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Hence, the correct answer is Option C.

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