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3 years ago

Which equation is balanced?

Chemistry

2 answers:

nadya68 [22]3 years ago

7 0

C “2Al + 3F2=2AlF3”

kiruha [24]3 years ago

3 0

Answer:

C is balanced, i just took the test

Explanation:

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Determine the mass percent composition of a solution made by dissolving 40.1g of LiOH in 681g of H2O

Lapatulllka [165]

<h3>Answer:</h3>

5.89%

<h3>Explanation:</h3>

We are given;

Mass of the solute, LiOH as 40.1 g
Mass of the solvent, H₂O as 681 g

We are required to calculate the mass percent composition of solution;

But; How do we calculate the mass percent composition of a solution?
We use the formula;

Mass composition of a solution = (Mass of solute/mass of solution) 100%

Therefore;

Mass Percent = (40.1 g/681 g)× 100%

= 5.888 %

= 5.89%

Therefore, the mass percent composition of the solution is 5.89%

7 0

3 years ago

If 21.00 mL of a 0.68 M solution of C6H5NH2 required 6.60 mL of the strong acid to completely neutralize the solution, what was

Andru [333]

Answer:

pH = 2.46

Explanation:

Hello there!

In this case, since this neutralization reaction may be assumed to occur in a 1:1 mole ratio between the base and the strong acid, it is possible to write the following moles and volume-concentrations relationship for the equivalence point:

$n_{acid}=n_{base}=n_{salt}$

Whereas the moles of the salt are computed as shown below:

$n_{salt}=0.021L*0.68mol/L=0.01428mol$

So we can divide those moles by the total volume (0.021L+0.0066L=0.0276L) to obtain the concentration of the final salt:

$[salt]=0.01428mol/0.0276L=0.517M$

Now, we need to keep in mind that this is an acidic salt since the base is weak and the acid strong, so the determinant ionization is:

$C_6H_5NH_3^++H_2O\rightleftharpoons C_6H_5NH_2+H_3O^+$

Whose equilibrium expression is:

$Ka=\frac{[C_6H_5NH_2][H_3O^+]}{C_6H_5NH_3^+}$

Now, since the Kb of C6H5NH2 is 4.3 x 10^-10, its Ka is 2.326x10^-5 (Kw/Kb), we can also write:

$2.326x10^{-5}=\frac{x^2}{0.517M}$

Whereas x is:

$x=\sqrt{0.517*2.326x10^{-5}}\\\\x=3.47x10^-3$

Which also equals the concentration of hydrogen ions; therefore, the pH at the equivalence point is:

$pH=-log(3.47x10^{-3})\\\\pH=2.46$

Regards!

6 0

3 years ago

During radioactive decay, atomic nuclei of unstable isotopes

Troyanec [42]

I think its A. because there are nuclear fusion and nuclear fission

5 0

4 years ago

19.5 g O2 is equal to how many moles of O2? _____moles O2

vredina [299]

Explanation:

Molar mass of O2: 32g/mol

Moles of O2 = 19.5 / 32 = 0.609mol

8 0

3 years ago

Which of these solids are most likely amorphous solids? Select all that apply. Rubber sugar plastic candle wax graphite glass.

Ostrovityanka [42]

The solids are characterized as amorphous and crystalline solids based on the arrangement of atoms. The solids that are amorphous are rubber, plastic, candle wax, and glass.

<h3>What are amorphous solids?</h3>

The solids have the arrangement of atoms in the lattice. The solids with an appropriate arrangement of atoms are crystalline solids. For example, sugar, graphite.

The solids with irregular arrangements of atoms in the lattice are amorphous solids. For example, glass, rubber.

Thus, the solids that are amorphous in nature are rubber, plastic, candle wax, and glass.

Learn more about amorphous solids, here:

brainly.com/question/4626187

3 0

3 years ago

Read 2 more answers