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mariarad [96]
3 years ago
14

Convert 72g of O2 to moles

Chemistry
2 answers:
Sonbull [250]3 years ago
5 0
Number of moles = Given mass/molar mass
Given mass : 72 gm
Molar mass of oxygen gas = 16×2 = 32 gm

Therefore, number of moles = 72/32 = 2.25
Volgvan3 years ago
4 0
Moles = mass / molar mass
molar mass of O2 is 32
therefore moles = 72/32
= 2.25 moles
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1. How many ATOMS of boron are present in 2.20 moles of boron trifluoride ? atoms of boron.
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Answer:

1. How many ATOMS of boron are present in 2.20 moles of boron trifluoride? atoms of boron.

2. How many MOLES of fluorine are present in  of boron trifluoride? moles of fluorine.​

Explanation:

The molecular formula of boron trifluoride is BF_3.

So, one mole of boron trifluoride has one mole of boron atoms.

1. The number of boron atoms in 2.20 moles of boron trifluoride is 2.20 moles.

The number of atoms in 2.20 moles of boron is:

One mole of boron has ---- 6.023x10^2^3 atoms.

Then, 2.20 moles of boron has

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2. Calculate the number of moles of BF3 in 5.35*1022 molecules.

(5.35x10^2^2 molecules/6.023x10^2^3)x 1mol\\=0.0888mol

One mole of boron trifluoride has three moles of fluorine atoms.

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What is the empirical formula for a compound if 300.00 g of it is known to contain 82.46224 g of molybdenum, 45.741 g of chlorin
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Answer:

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Explanation:

First we calculate the mass of bromine in the compound:

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Then we<u> calculate the number of moles of each element</u>, using their <em>respective molar masses</em>:

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Now we <u>divide those numbers of moles by the lowest number among them</u>:

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  • 2.150 mol Br / 0.9594 = 2.24 ≅ 2

Meaning the empirical formula is MoClBr₂.

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