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sladkih [1.3K]
2 years ago
7

29.2 grams of methane (carbon tetrahydride), CH4, is how

Chemistry
1 answer:
Elena-2011 [213]2 years ago
5 0

Answer:

1.83moles

Explanation:

Given parameters:

Mass of methane given  = 29.2g

Unknown:

Number of moles = ?

Solution:

To find the number of moles in this mass of a compound;

     Number of moles  = \frac{mass}{molar mass}  

Molar mass of CH₄   = 12 + 4(1)  = 16g/mol

Now;

    Number of moles  = \frac{29.2}{16}   = 1.83moles

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Answer:

The correct answer is 4

Explanation:

Boron trifluoride (BF₃) has a molecular geometry (as shown in the image in the question) referred to as trigonal planar; this is because each of the the fluorine atoms/molecules (bonded to the central boron atom) is placed in such a way that they form the three "end points"/"domains" of an equilateral triangle. Hence, the correct option is the last option.

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How can the law of conservation of<br> mass for a chemical reaction be expressed?
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Answer:

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Explanation:

How does the concept of conservation of mass apply to chemical reactions? the reactants and products have exactly the same atoms. the reactants and products have exactly the same molecules. the change in the amount of matter is equal to the change in energy.

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3 years ago
What is arranged to form a material with a crystal structure
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Answer:

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Explanation:

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Answer:

Explanation:

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Electronic configuration:

Cd₄₈ = [Kr] 4d¹⁰ 5s²

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Electronic configuration:

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Electronic configuration:

I₅₃ = [Kr] 4d¹⁰ 5s² 5p⁵

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Electronic configuration:

K₁₉ = [Ar] 4s¹

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Strontium is present in group two. it is alkaline earth metal. its atomic number is thirty eight and have two valance electrons.

Electronic configuration:

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