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Alex_Xolod [135]
3 years ago
9

How many moles of chloride ions are in 0.2550 g of aluminum chloride using AlCl3 's molar mass of 133.34 g / mol:?

Chemistry
2 answers:
Xelga [282]3 years ago
7 0
I got 0.001912 using dimensional analysis. See the picture for work.

Westkost [7]3 years ago
3 0

Explanation:

It is known that number of moles is the amount of mass present in a given molar mass of the substance.

Mathematically,   No. of moles = \frac{mass}{\text{molar mass}}

We are given that mass of AlCl_{3} is 0.255 g and molar mass of AlCl_{3} is 133.34 g/mol.

Therefore, number of moles of AlCl_{3} is calculated as follows.

        No. of moles = \frac{mass}{\text{molar mass}}

                              = \frac{0.255 g}{133.34 g/mol}  

                              = 1.912 \times 10^{-3} mol

Since, there are three chlorine atoms present in one mole of AlCl_{3}. Therefore, moles of chlorine ions present in given 0.255 g will be calculated as follows.

             3 \times 1.912 \times 10^{-3} mol

            = 5.736 \times 10^{-3} mol

Thus, we can conclude that 5.736 \times 10^{-3} mol chloride ions are in 0.2550 g of aluminum chloride using AlCl_{3}'s molar mass of 133.34 g/mol.

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Determine the formula of chromic acid.
Katyanochek1 [597]

<u>Answer:</u> The formula of chromic acid is H_2CrO_4

<u>Explanation:</u>

We are given an ionic compound named as chromic acid. This acid is formed by the combination of hydrogen ion and chromate ion.

An acid is defined as the substance which releases hydrogen ion when dissolved in water.

Hydrogen is the 1st element of periodic table having electronic configuration of 1s^1.

This element will loose 1 electron to form H^{+} ion.

Chromate ion is a polyatomic ion having chemical formula of CrO_4^{2-}

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

So, the chemical formula for the given compound is H_2CrO_4

Thus, the formula of chromic acid is H_2CrO_4

8 0
3 years ago
When 3243. grams of iron (III) chloride are reacted with 511.8 grams of hydrosulfuric acid, which is the limiting reactant?
AleksAgata [21]

Answer:

Hydrosulfuric acid will act as limiting reactant.

Explanation:

Given data:

Mass of iron(III) chloride = 3243.0 g

Mass of hydrosulfuric acid = 511.8 g

Limiting reactant = ?

Solution:

Chemical equation:

2FeCl₃ + 3H₂S       →       Fe₂S₃ + 6HCl

Number of moles of iron(III) chloride:

Number of moles = mass/molar mass

Number of moles = 3243.0 g/ 162.2 g/mol

Number of moles = 20 mol

Number of moles of hydrosulfuric acid:

Number of moles = mass/molar mass

Number of moles = 511.8 g/ 34.1 g/mol

Number of moles = 15 mol

Now we will compare the moles of both reactant with products

                      FeCl₃          :          Fe₂S₃

                       2                :            1

                      20               :          1/2 ×20 = 10

                      FeCl₃          :            HCl

                       2                :              6

                      20               :          6/2 ×20 = 60

                      H₂S             :          Fe₂S₃

                       3                :            1

                      15               :          1/3 ×15 = 5

                      H₂S            :            HCl

                       3                :              6

                      15                :          6/3 ×15 = 30

Hydrosulfuric acid producing less number of moles of product thus, it will act as limiting reactant.

 

5 0
3 years ago
What fact shows that baking a chocolate chip cookie is a chemical reaction?
Alina [70]
The final product cannot be converted back to the original ingredients. This is why baking a chocolate chip cookie is a chemical reaction.
4 0
3 years ago
Gasoline has a density of 0.7197 grams per milliliter. Calculate the mass, in grams, of a sample of gasoline with a volume of 48
barxatty [35]

Answer:

34.9103 or 34.9 g

Explanation:

Remember Density is a broken heart: m/v.

In this scenario (Let x = # of grams in the sample of gasoline),

D = 0.7198 g/mL = x g / 48.5 mL

So,

(0.7198 g/mL) * (48.5 mL) = x g

x g = 34.9103 = 34.9 g (Accounting for Significant Figures)

8 0
2 years ago
Which is the correct symbol for an isotope of bromine with 35 protons and 38 neutrons? A) 35Br38 B) 73Br C) 35Br D) 73Br
Brilliant_brown [7]
I think it may be B.


6 0
3 years ago
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