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Margarita [4]
4 years ago
13

What is the mole fraction of NaOH in an aqueous solution that contains 15% NaOH by mass?

Chemistry
1 answer:
zhenek [66]4 years ago
6 0

Answer:

0.074

Explanation:

15% means that in 100 g of solution 15 g sodium hydroxide is present.

Mass of water = 100 - 15 = 85 g

Number of moles of sodium hydroxide:

Number of moles = 15 g/40 g/mol

Number of moles = 0.375 mol

Number of moles of water:

Number of moles = 85 g/18 g/mol

Number of moles = 4.7 mol

Moles fraction of NaOH:

moles of NaOH/ moles of solvent + moles of solute

0.375 mol/ 0.375 mol+4.7mol

0.375 mol / 5.075 mol

0.074

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Which of the following changes in the state of a substance results in an increase in the entropy? Gas to solid Gas to liquid Liq
kifflom [539]

Answer:

Solid to liquid

Explanation:

Entropy is a state of randomness or disorderliness of the particles of a system. Some part of the heat energy of a system is related to the state of disorder or randomness of the particles of the system.

The entropic level of a system depends on two of major factors:

1. Temperature: Entropy increases with temperature rise due to the fact that the randomness of the particles of a system increases at a higher temperature.

2. Physical state of matter: The increasing order of entropy is:

Solid < Liquid < Gas

Gases are the most disordered and have the highest entropy. In moving from solid to liquid to gas, entropy of a system would increase.

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3 years ago
I put 40 points on this!!! PLEASE HELP!! I NEED AN A OR MY MOM IS GONNA KILL ME!
pshichka [43]
Hi there!

For one and two, I could not find anything. I highly suggest you talk to your textiles teacher for both one, two, and five, and review the whole assignment with them.

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3 years ago
Alpha Decay
Inessa [10]

Thorium 234 is the daughter product of Uranium-238 decays whereas protactinium 234 is the daughter product of Thorium -228.

<h3>What are the products of Uranium-238 and Thorium -228?</h3>

If an atom of Uranium-238 decays via alpha emission, a nucleus of uranium 238 decays by alpha emission to form a daughter nucleus, thorium 234 while If an atom of Thorium -228 decayed via beta emission, the daughter isotope is protactinium 234.

So we can conclude that thorium 234 is the daughter product of Uranium-238 decays whereas protactinium 234 is the daughter product of Thorium -228.

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2. Petroleum is used to make
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3 years ago
What is the mass of aluminum oxide (101.96 g/mol) produced from 1.74 g of manganese(iv) oxide (86.94 g/mol)?
NemiM [27]

the mass of aluminum oxide (101.96 g/mol) produced from 1.74 g of manganese(iv) oxide (86.94 g/mol) is 1.36g

The reaction is 3 MnO2 + 4 Al ------ 2Al2o3+ Mn

3 mole of manganese oxide give 2 moles of aluminum oxide so by the reaction n( MnO2)/3 =n(al203)2

the formula is n= mass/M so, now substituting values

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2 years ago
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