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3 years ago

What is the mass of 4.40 moles of magnesium chloride, MgCl2?

1 answer:

3 0

Since the number of moles of a substance is the mass divided by the molar mass of the substance, we can just simply multiply the molar mass of magnesium chloride by the number of moles, which is 4.40 in this case.

To find the molar mass, refer to the periodic table for the relative atomic mass of Mg and Cl and add them together. Since there’s 2 chloride ions in MgCl2, double the relative atomic mass of Cl when adding.

24.31 + 35.45x2
=95.21

Now just multiply 95.21 to 4.40mol, which you’ll get 418.9g (corrected to 3 significant figures)

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Carlos stomps a soda con flat and throw it away. Which of the following statements BEST describes the change made in the soda ca

NemiM [27]

Answer:

The soda can kept the same mass as it changed in shape only

Explanation:

Law of Conservation states "mass cannot be created or destroyed" therefore this is why the mass hasn't changed, but when it was smashed the shape changed.

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3 years ago

Aluminum sulfate reacts with barium chloride to form the insoluble compound, barium sulfate. The reaction proceeds according to

Kaylis [27]

Answer: $BaCl_2$ is the limiting reagent and $Al_2(SO_4)_3$ is the excess reagent.

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of aluminium sulphate}=\frac{150g}{342.15g/mol}=0.438moles$

$\text{Moles of barium chloride}=\frac{200g}{208.23g/mol}=0.960moles$

The balanced chemical reaction is:

$Al_2(SO_4)_3+3BaCl_2\rightarrow 2AlCl_3+3BaSO_4$

According to stoichiometry :

3 moles of $BaCl_2$ require = 1 mole of $Al_2(SO_4)_3$

Thus 0.960 moles of $BaCl_2$ will require= $\frac{1}{3}\times 0.960=0.320moles$ of $Al_2(SO_4)_3$

Thus $BaCl_2$ is the limiting reagent as it limits the formation of product and $Al_2(SO_4)_3$ is the excess reagent as it is left.

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3 years ago

How did Moseley establish a more accurate periodic table?

Ket [755]

Answer:

by arranging the elements according to atomic mass instead of atomic table

7 0

3 years ago

Read 2 more answers

which model of an atom first introduced the idea of an nucleus? A. Dalton model, B.Thomson model, C. Rutherford model ,or D. Boh

frez [133]

The answer is Rutherford's model

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4 years ago

Each joule is one ____. newton of energy gram of energy meter of energy newton·meter of energy

bezimeni [28]

Joule is a unit of work or energy. Work is calculated by multiplying the amount of force exerted with the displacement of the object. The equation would then be,
W = F x d
If we are to write the units of measurement for the given parameters, that would be
Joules = Newton x meter
Thus, the answer is newton.meter of energy. The answer is the last choice.

5 0

4 years ago