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Allisa [31]
3 years ago
8

Why does half a mole of water molecules have more mass than 2 moles of helium atoms?

Chemistry
2 answers:
Fantom [35]3 years ago
6 0

Answer:

everything (matter) is made up of molecules(atoms)

Explanation:

RUDIKE [14]3 years ago
5 0

Answer:

Mass H2O = 9.01 grams

Mass He = 8.0 grams

The mass per mol of water is more than the mass per mol of helium.

Explanation:

Step 1: Data given

Molar mass water = 18.02 g/mol

Molar mass of helium = 4.0 g/mol

Number of moles H2O = 0.5 moles

Number of moles He = 2.0 moles

Step 2: Calculate mass

Mass = moles * molar mass

Mass H2O = 0.5 moles * 18.02 g/mol

Mass H2O = 9.01 grams

Mass He = 2.0 moles * 4.0 g/mol

Mass He = 8.0 grams

The mass per mol of water is more than the mass per mol of helium.

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Ionization energy and electronegativity show similar trends in the periodic table. Describe these trends. What is the significan
marin [14]
Electronegativity measures how much an atom likes to pull electrons away from another one. Ionization energy measures how much an atom doesn't want to lose electrons. As an atom that wants to gain electrons will clearly not want to lose electrons, these trends are basically identical.
3 0
3 years ago
How many moles of CH4 are in 148.6 g? Round your answer to two decimal places.
Dafna1 [17]

Answer:

9.29 mol

Explanation:

Given data:

Number of moles = ?

Mass = 148.6 g

Solution:

Number of moles = mass/ molar mass

Molar mass of CH₄ = 16 g/mol

Now we will put the values in formula.

Number of moles = 148.6 g/ 16 g/mol

Number of moles = 9.29 mol

Thus 148.6 g have 9.29 moles.

6 0
3 years ago
What season does the sourtther hempishere experience when it is away from the sun?
kakasveta [241]
I believe Winter is <span>your answer.</span>
4 0
4 years ago
Zinc phosphide, Zn3P2, is often used as a rat poison. Phosphorus has 5 valence electrons. How many valence electrons does each z
Helen [10]
The choices that should have accompanied this question were:
A. 1 
<span>B. 2 </span>
<span>C. 3 </span>
<span>D. 4 
</span>
My answer is B. 2.
Below is an explanation, I found while doing the research.

<span>Phosphate needs 3 electrons each totaling 6 electrons so each zinc will need to give up 2 electrons.

Phosphate wants to imitate the electron configuration of Argon because noble configurations are the most stable. With P getting the extra electrons the valence shell will be 3s2 3p6, which is the same as Argon. Without the extra electrons, the P valence shell looks like this 3s2 3p3, now you can see why each phosphorus wants 3 more electrons, that will make it 3s2 3p6, just like Argon.</span>
8 0
3 years ago
Read 2 more answers
What is the molality of chloride ions in an aqueous solution of magnesium chloride for which xmgcl2 is 0.01?
AfilCa [17]
MgCl₂ ---> Mg(2+) + 2Cl(-)
0,01-x.............x.............2x

MgCl₂ ---> Mg(2+) + 2Cl(-)
0,01-x.............x.............2x
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The molality of chloride ions is 0,02M.
8 0
4 years ago
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