Answer:
m = 190. g MgCl2
Explanation:
Use a molar ratio to get the # of moles MgCl2 produced from 4.00 mol of HCl:
4.00 mol HCl × (1 mol MgCl2/2 mol HCl) = 2.00 mil MgCl2
So 2.00 moles of MgCl2 will be produced. To find the mass in grams, use the molar mass of MgCl2:
2.00 mol MgCl2 × (95.211 g MgCl2/1 mol MgCl2)
= 190. g MgCl2
Answer:
Explanation:
Molal freezing point depression constant of butanol Kf = 8.37⁰C /m
ΔTf = Kf x m , m is no of moles of solute per kg of solvent .
mol weight of butanol = 70 g
235.1 g of butanol = 235.1 / 70 = 3.3585 moles
3.3585 moles of butanol dissolved in 4.14 kg of water .
ΔTf = 8.37 x 3.3585 / 4.14
= 6.79⁰C
Depression in freezing point = 6.79
freezing point of solution = - 6.79⁰C .
11.82 x 1 mole / (molar mass)
The molar mass = 197 g/mol
11.82 / 197 = .06
Answer:
≈ 2.74 mol 
(I rounded to 3 sig figs because the starting amount has 3 sig figs.)
Explanation:
2.73736313184 mol ≈ 2.74 mol
Hope this helps!
The features that can be observed from a substance that undergoes a chemical change is that the shape is altered. That is option D.
<h3>What is a chemical change?</h3>
A chemical change is the change in which two or more chemical substances involved in a chemical reaction rearranges their chemical bonds to form a new product.
In the chemical change, the shape of an object can be changed and the object will still remain true to its chemical composition.
Therefore, the features that can be observed from a substance that undergoes a chemical change is that the shape is altered.
Learn more about chemical reaction here:
brainly.com/question/11231920
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