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vovangra [49]
3 years ago
7

Question 9 of 10

Chemistry
1 answer:
solniwko [45]3 years ago
6 0
Answer: A. Look at the trial’s results to see how the design can be improved.
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The solubility of "Compound Y" in hot ethanol (78 °C) is 0.13 g/mL, and 0.03 g/mL in cold ethanol (0 °C). For this question, ass
DENIUS [597]

Answer:

i) 16 mL of ethanol

ii) maximum amount recoverable = 15.52 g; percentage recovery = 97%

iii) maximum amount recoverable = 15.1 g

percentage recovery = 94.4%

Explanation:

Solubility = mass/volume

i) mass of ethanol recovered per mL of ethanol when cooled from 78 °C to 0 °C = 0.13 - 0.03 = 0.10 g

Therefore 1.60 g of Y will require a minimum of 1.60 x 1 mL/0.10 g = 16 mL of ethanol

ii) maximum amount of Y that can be recovered is given as :

mass of Y left in solution after recrystallization, x is obtained

0.03 g/mL = x g/16 mL

x = 0.48 g

maximum amount recoverable = 16 - 0.48 = 15.52 g

percentage recovery = (15.52/16) x 100 % = 97%

iii) if 30 mL of ethanol were used:

mass of Y left in solution after recrystallization, x is obtained;

0.03 g/mL = x g/30 mL

x = 0.03 x 30 = 0.9 g

maximum amount recoverable = 16 - 0.9 = 15.1 g

percentage recovery = (15.1/16) x 100% = 94.4%

8 0
4 years ago
Which characteristic is found in liquids and gases? A. Has a fixed volume B. Particles stay in a fixed position C. No particle m
STALIN [3.7K]

Answer:

The answer to your question is letter D.

Explanation:

A. Has a fixed volume This is not the right answer, liquids and gases take the shape of the container in which they are.

B. Particles stay in a fixed position This answer is wrong, this characteristic is  of solids but not of liquids and gases.

C. No particle movement This characteristic is also of solids, in liquids and gases the particles can move.

D. Takes the shape of the container. This is the right answer, liquids and gases take the shape of the container.

6 0
3 years ago
Read 2 more answers
The pressure inside an aerosol can is 3.80 atm at 25.0°C. If the temperature is increased from 25.0°C to 100.0°C, what would be
ladessa [460]

Answer:

B. 4.76 atm

Explanation:

P_1 = Initial pressure = 3.8 atm

T_1 = Initial temperature = 25+273.15\ \text{K}

P_2 = Final pressure

T_2 = Final temperature = 100+273.15\ \text{K}

From Gay Lussac's law we have

\dfrac{P_2}{P_1}=\dfrac{T_2}{T_1}\\\Rightarrow P_2=P_1\dfrac{T_2}{T_1}\\\Rightarrow P_2=3.8\times\dfrac{100+273.15}{25+273.15}\\\Rightarrow P_2=4.76\ \text{atm}

The pressure inside the can would be 4.76\ \text{atm}.

7 0
3 years ago
how much gram of water is needed to dissolve 1.5mol sodium chloride Nacl, to prepare 2.5molality solution of Nacl​
stellarik [79]

Answer:

You can view more details on each measurement unit: molecular weight of NaCl or grams This compound is also known as Sodium Chloride. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles NaCl, or 58.44277 grams.

5 0
3 years ago
One way that scientists ensure that data are reliable is through
Vesna [10]
Replicating experiments

(If u don’t mind can y mark me brainiest it would really help :) )
4 0
4 years ago
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