Molality is a way to express the concentration of a solution that represents the number of moles of

Which factor has the greatest effect on the melting point of a crystalline solid

slava [35]

Inter-molecular forces. The greater the attraction between particles the more energy required to break the forces or "melt" them.

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7 0

2 years ago

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Wine goes bad soon after opening because the ethanol (CH,CH,OH) in it reacts with oxygen gas (0.) from the air to form water (11

daser333 [38]

Answer: The mass of water produced is 1.8 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of ethanol = 4.59 g

Molar mass of ethanol = 46.07 g/mol

Putting values in equation 1, we get:

$\text{Moles of ethanol}=\frac{4.59g}{46.07g/mol}=0.0996mol$

The chemical equation for the reaction of ethanol with oxygen gas follows:

$CH_3CH_2OH+O_2\rightarrow CH_3COOH+H_2O$

By Stoichiometry of the reaction;

1 mole of ethanol produces 1 mole of water.

So, 0.0996 moles of ethanol will produce = $\frac{1}{1}\times 0.0996=0.0996mol$ of water.

Now, calculating the mass of water from equation 1, we get:

Molar mass of water = 18 g/mol

Moles of water = 0.0996 moles

Putting values in equation 1, we get:

$0.0996mol=\frac{\text{Mass of water}}{18g/mol}\\\\\text{Mass of water}=(0.0996mol\times 18g/mol)=1.8g$

Hence, the mass of water produced is 1.8 grams

5 0

3 years ago

Metallic bonding occurs between atoms of 1.)sulfur 2.)copper 3.)fluorine 4.)carbon

adelina 88 [10]

Answer:

copper

Explanation:

metallic bonds occur among the metal atoms where iconic bonds join metal and nonmetals metallic bonding joins a bolt of metal atoms a sheet of aluminum foil and a copper wire are both place where you can see metallic bonding in action the Sea of electrons that is free to flow about the crystal of positive metal ions

3 0

2 years ago

How many moles of O atoms are present in a 254 g sample of carbon dioxide?

MaRussiya [10]

Answer:

11.6mol

Explanation:

CO2 = 44g

2 mol of O2 = 44g

X mol of O2 = 254

Cross multiply

X= 11.6mol

3 0

2 years ago

How do greenhouse gases in the atmosphere affect Earth’s temperature?

Maurinko [17]

Answer: The greenhouse gases cause Earth's surface to heat up from the sunlight.

Explanation: The greenhouse gases causes the Earth's surface to warm up in the morning and at night, the surface cools down. When it cools down, that gives the heat a chance to get back into the air, but some of the heat is trapped (which is caused by the greenhouse gases). That's why, on average, Earth stays at 58 degrees Fahrenheit.

4 0

3 years ago