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2 years ago

How many moles of H atoms are in 15.2 grams of pure ice?

Chemistry

1 answer:

nikitadnepr [17]2 years ago

6 0

The number of moles of H atoms in 15.2 grams of pure ice is 0.850 moles

The number of moles of O atoms in 15.2 grams of pure ice is 13.50 moles

An atom is a smallest indivisible particle of a chemical element that is capable of independent existence.

Pure ice contains the H2O molecules and the molar mass of H2O is 18.02 g/mol

Using the relation:

number of moles = mass/molar mass

The number of moles of H2O = 15.2 grams/18.02 g/mol

number of moles of H2O = 0.8435 moles

If the atomic mass of H and O are as follow:

the atomic mass of H atom is = 1.00784 g/mol
the atomic mass of O atom is = 15.999 g/mol

Then:

the number of H atoms in 15.2 grams of pure ice = mass of H atom × molar mass of H2O.

the number of H atoms = 0.8435 mol × 1.00784 g/mol

the number of H atoms = 0.850 moles

the number of O atoms in 15.2 grams of pure ice = 0.8435 mol × 15.999 g/mol

the number of O atoms = 13.50 moles

Learn more about atoms here:

brainly.com/question/25832904

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Answer:

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Explanation:

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3 years ago

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What is the molarity of a solution containing 55.8 g of mgcl2 dissolved in 1.00 l of solution?

MakcuM [25]

The answer is 0.59 M.

Molar mass (Mr) of MgCl₂ is the sum of the molar masses of its elements.
So, from the periodic table:
Mr(Mg) = 24.3 g/l
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Mr(MgCl₂) = Mr(Mg) + 2Mr(Cl) = 24.3 + 2 · 35.45 = 24.3 + 70.9 = 95.2 g/l

So, 1 mol has 95.2 g/l.

Our solution contains 55.8g in 1 l of solution, which is 55.8 g/l

Now, we need to make a proportion:
1 mole has 95.2 g/l, how much moles will have 55.8 g/l:
1 M : 95.2 g/l = x : 55.8 g/l
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What needs to happen for the equation CH4 + O2 → CO2 + H2O to be balanced?

worty [1.4K]

B. This is because the Hydrogen and Oxygen need balanced out.

Current-

C-1 | C-1
H-4 | H-2
O-2 | O-3

Adding a coefficient of 2 before oxygen in the reactants and H2O in the products would balance this equation

<span>CH4 + 2O2 → CO2 + 2H2O</span>
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3 years ago

If one benzene molecule is placed in water, the total entropy of the water + benzene system:___________

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Answer:

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