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Elena L [17]
2 years ago
14

Answer the following questions:

Chemistry
2 answers:
Y_Kistochka [10]2 years ago
8 0
Recrystallization is a technique used to purify chemicals, it's used for solid compounds most
Vera_Pavlovna [14]2 years ago
4 0

Answer:

fdfdgiukjgrguhjnfvthhhdqddwsvhjjj

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What is the molarity (M) of the following solutions?
Dennis_Churaev [7]

Answer:

The molarity (M) of the following solutions are :

A. M = 0.88 M

B. M = 0.76 M

Explanation:

A. Molarity (M) of 19.2 g of Al(OH)3 dissolved in water to make 280 mL of solution.

Molar mass of Al(OH)3 = Mass of Al + 3(mass of O + mass of H)

                                      = 27 + 3(16 + 1)

                                      = 27 + 3(17) = 27 + 51

                                      = 78 g/mole

Al(OH)_3 = 78 g/mole

Given mass= 19.2 g/mole

Mole = \frac{Given\ mass}{Molar\ mass}

Mole = \frac{19.2}{78}

Moles = 0.246

Molarity = \frac{Moles\ of\ solute}{Volume\ of\ solution(L)}

Volume = 280 mL = 0.280 L

Molarity = \frac{0.246}{0.280)}

Molarity  = 0.879 M

Molarity  = 0.88 M

B .The molarity (M) of a 2.6 L solution made with 235.9 g of KBr​

Molar mass of KBr = 119 g/mole

Given mass = 235.9 g

Mole = \frac{235.9}{119}

Moles = 1.98

Volume = 2.6 L

Molarity = \frac{Moles\ of\ solute}{Volume\ of\ solution(L)}

Molarity = \frac{1.98}{2.6)}

Molarity = 0.762 M

Molarity = 0.76 M

4 0
2 years ago
What is the property of a neutron?
UNO [17]

Answer:

A) 0 charge

Explanation:

neutron=neutral

7 0
3 years ago
What technology can make coal a cleaner fuel? fluidized-bed combustion building smoke stacks taller implementing a prewash of co
anastassius [24]
Answer : The technology that can make coal a cleaner fuel is to use lower quality of coal with high sulfur content.

Explanation : Using lower quality of coal with high amount of sulfur in it can make coal a cleaner fuel because of high amount of sulfur it will have better combustion.  
4 0
3 years ago
How many moles of oxygen are needed to burn 425g of sulfur
Anika [276]
I believe 212.5m, but I may be wrong, I’m a little rusty with moles
3 0
2 years ago
Read 2 more answers
What is the most stable monatomic ion formed from magnesium?
Alekssandra [29.7K]

Answer:

Mg²⁺

Explanation:

The electron configuration of Mg is [Ne]3s².

It is easier for Mg to get a complete octet by losing two electrons and exposing the neon core than it is to add eight electrons and get an Ar octet.

The most stable monatomic Mg ion is Mg²⁺.

7 0
3 years ago
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