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larisa86 [58]
3 years ago
9

1.05kg of aluminum what is the heat capacity ?

Chemistry
1 answer:
vitfil [10]3 years ago
8 0
The aluminum can with stand <span>0.942 J° C  of heat </span>
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A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 13.06% naphthalene by mass. Calculate
worty [1.4K]

Answer: The vapor pressure of the solution at 25^0C is 137 torr

Explanation:

As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.

The formula for relative lowering of vapor pressure will be,

\frac{p^o-p_s}{p^o}=i\times x_2

where,

\frac{p^o-p_s}{p^o}= relative lowering in vapor pressure

i = Van'T Hoff factor = 1 (for non electrolytes)

x_2 = mole fraction of solute  =\frac{\text {moles of solute}}{\text {total moles}}

Given : 13.06 g of napthalene is present in 100 g of solution, thus (100-13.06) g = 86.94 g of hexane

moles of solute (napthalene) = \frac{\text{Given mass}}{\text {Molar mass}}=\frac{13.06g}{128g/mol}=0.102moles

moles of solvent (hexane) = \frac{\text{Given mass}}{\text {Molar mass}}=\frac{86.94g}{86g/mol}=1.01moles

Total moles = moles of solute (napthalene)  + moles of solvent (hexane) = 0.102 + 1.01 = 1.112

x_2 = mole fraction of solute (napthalene) =\frac{0.102}{1.112}=0.0917

\frac{151-p_s}{151}=1\times 0.0917

p_s=137torr

Thus the vapor pressure of the solution at 25^0C is 137 torr

7 0
2 years ago
A graduated cylinder is filled with 50.7 mL of water. If a 10.0 g piece of zinc metal is added to the water, and the volume rise
Triss [41]

Answer:

<h3>The answer is 7.14 g/mL</h3>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume} \\

From the question

mass = 10 g

volume = final volume of water - initial volume of water

volume = 52.1 - 50.7 = 1.4 mL

We have

density =  \frac{10}{1.4}  \\  = 7.142857...

We have the final answer as

<h3>7.14 g/mL</h3>

Hope this helps you

5 0
3 years ago
20. A compound's empirical formula is C5H5O If the molecular mass of the compound is
MA_775_DIABLO [31]

Answer:

Just use a text book.. So that you get the concept

8 0
3 years ago
Sulfuric acid is formed when sulfur dioxide reacts with oxygen and water. Write a balanced chemical equation for the reaction. (
Nesterboy [21]

Balanced chemical equation for the reaction is:

2SO_{2} (g) + O_{2} (g)+ 2H_{2}O (l) ⇒H_{2} S_{} O_{4}

Moles of H_{2} S_{} O_{4} formed is 5.75 moles.

Moles of oxygen used is 5.75 moles in the reaction.

Explanation:

Data given:

moles of SO_{2} = 11.5 moles

moles of H_{2} S_{} O_{4} = ?

Moles of O_{2} needed =?

balanced equation with states of matter =?

Balanced chemical reaction under STP condition is given as:

2SO_{2}(g) + O_{2} (g) + 2H_{2}O (l) ⇒H_{2} S_{} O_{4}

From the balanced reaction 2 moles of sulphur dioxide reacted to form 1 mole of sulphuric acid:

so, from 11.5 moles of SO_{2}, x moles of H_{2} S_{} O_{4} is formed

\frac{1}{2}  =\frac{x}{11.5}

2x = 11.5

x = 5.75 moles of sulphuric acid formed.

From the balanced reaction 1 mole of oxygen reacted to form 1  mole of sulphuric acid.

when 11.5 moles of Sulphur dioxide reacted then oxygen in the reaction is 5.75 moles.

7 0
3 years ago
In a compound, chemical energy is _______________ when bonds break.
Romashka-Z-Leto [24]

Answer:

In a compound, chemical energy is _____required__________ when bonds break.

6 0
2 years ago
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