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kotykmax [81]
2 years ago
7

32. Calculate How many kilojoules of heat are re-

Chemistry
1 answer:
mart [117]2 years ago
4 0

Answer:

ΔH = 41.7 kj

Explanation:

Given data:

Mass of ethanol = 50 g

Heat required to vaporize = ?

Boiling point of ethanol = 78.3°C

Molar heat of vaporization = 38.6 kj/mol

Solution:

First of all we will calculate the number of moles.

Number of moles = mass / molar mass

Number of moles = 50 g/ 46.07 g/mol

Number of moles = 1.08 mol

ΔH = 38.6 kj/mol ×1.08 mol

ΔH = 41.7 kj

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Which type of substance can separated using a centrifuge?<br>​
Natasha2012 [34]

Answer:

Its separates the components of heterogeneous mixtures.

like examples :-

  • liquids in liquids,
  • solids in liquids,
  • solids and liquids in gases.

4 0
3 years ago
Magnesium hydroxide is used as an antacid in milk of magnesia and reacts with hydrogen chlrode in the stomach to form water and
8_murik_8 [283]
Mg(OH)2 +2HCl---> MgCl2+2H2O
3 0
2 years ago
- How many moles of S2 are needed to produce 1.50 moles of SO2 gas? S2 + 20, ----&gt; 2802​
matrenka [14]

Answer:

0.75 moles

Explanation:

S2 + 2O2 = 2SO2

From the reaction above,

We see that number of moles attached to S2 is 1 and number of moles attached to SO2 is 2.

Since we want to find how many moles of S2 are needed to produce 1.50 moles of SO2 gas

The answer is gotten by proportion;

Number of moles = 1/2 × 1.5 = 0.75 moles

3 0
2 years ago
Draw the major monobromination product formed by heating the following alkane with bromine.
yawa3891 [41]
A monobromination reaction of an alkane involves an alkane and bromine. The position of the hydrogen atom that will be substituted by the bromine free radical will depend on the order of the alkane. The bromine will attach to the carbon that has the most substituents.
8 0
3 years ago
24. The air in a small 250 cm birthday balloon is at a pressure of 760 torr. A boy sits on it at
kvv77 [185]

Answer:

1.14atm

Explanation:

Given parameters:

V1 = 250cm³ ;

              1000cm³ = 1dm³;  so this is 0.25dm³

P1  = 760torr

            760torr  = 1atm

       

V2  = 220cm³ ; 0.22dm³

Unknown:

New pressure = ?

Solution:

To solve this problem, we apply Boyle's law and we use the expression below:

       P1 V1 = P2V2

The unknown is P2;

            1 x 0.25  = P2 x 0.22

                 P2  = 1.14atm

7 0
2 years ago
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