3 years ago

3. (1 p) How many oxygen atoms are in 2.5 moles of nitrogen dioxide?

Chemistry

1 answer:

uranmaximum [27]3 years ago

7 0

1.505X10^24 hope this helped :)

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Which of the following chemical formulas could represent a stable compound formed with an element "X" from group 1A and Oxygen?

vaieri [72.5K]

Answer:

2. X₂O

Explanation:

Elements in group 1A are known as alkali metal. Examples include lithium, sodium, and potassium among others.
These elements have one valence electron in the outermost energy level and therefore form cations with a charge of +1.
They have a valency of 2.
Oxygen, on the other hand,has a valency of 2.
Therefore, a chemical formula of a compound formed when an element in group 1A say X reacts with oxygen will be X₂O.
To write the formula, we identify the symbol of the elements and their valence.
Then the atoms of the two elements exchange their valencies which are written as a subscript on each symbol of an element.

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3 years ago

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iogann1982 [59]

Answer: b

Explanation:

its b

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3 years ago

CALCULATE: Determine the volume occupied by 0.582 mol of a gas at 15 degrees Celsius if the pressure is 81.8 KPA?

7nadin3 [17]

PV=nRT

So

NRT/P=V ...
SI units for pressure is pascals so 81.8KPA = 81.8 x 10^3 PA
SI units for temperature is kelvin so 15 degrees celsius = 15 +273 = 288K

(0.582 x 8.314 x 288)/81.8 x 10^3 = 0.017 m3 (cubic meters)

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3 years ago

Calculate the molar mass of a compound if 0.372 mole of it has a mass of 152g

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Answer:

409 g/mol

Explanation:

you divide the mass by the moles to get the molar mass

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