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3 years ago

What is the HCl concentration if 52.0 mL of 0.350 M NaOH is required to titrate a 30.0 mL sample of the acid?

1 answer:

8 0

Volume HCl = 52.0 mL in liters: 52.0 / 1000 => 0.052 L

Molarity HCl = ?

Number of moles NaOH :

V = 30,0 mL / 1000 => 0.03 L

Molarity = 0.350 M

n = M x V

n = 0.350 x 0.03 => 0.0105 moles of NaOH

Mole ratio :

HCl + NaOH = NaCl + H2O

1 mole HCl ---------- 1 mole NaOH
? moles HCl --------- 0.0105 moles NaOH

0.0105 x 1 / 1 => 0.0105 moles of HCl

Therefore:

M = n / V

M = 0.0105 / 0.052

= 0.201 M

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What is the empirical formula of propene CH3 CH2 CH2

kiruha [24]

Answer:

CH

Explanation:

Molecular formula of propene : C₃H₆

Take the HCF of carbon and hydrogen atoms :

3 = 3
6 = 2 x 3

Then, we can write the formula as :

3CH
This means there are 3 moles present

Empirical Formula :

Molecular Formula / No. of moles
C₃H₆ / 3
CH

The empirical formula of propene is CH

6 0

1 year ago

What is the oxidation state of each element in so32â?

Ierofanga [76]

Same answer, different setup. We know that the sum of the oxidation numbers is zero for a compound and the ionic charge for a polyatomic ion, and we know that sulfite ion is -2.

Create an algebraic equation by multiplying the subscripts times the oxidation number of a single element.

+x -6 = -2
+x -2
S O3

Solve for x
x = +4

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2 years ago

I have these answered, but I'd like someone to check them for me? Plz and thanks :)

zlopas [31]

1. The third option is the least soluble in water because it is the chain with the most number of hydrocarbons. Next is the second option while the first one is the most soluble.
2. Statements 1 and 2 are true. The third option is not true all the time because it depends on the structure of the compound.

4 0

3 years ago

If earth was a hard boiled egg,which part of earth would the egg white represent?

romanna [79]

Answer:

The egg white will represent the outer layer which is the we are located on!

Explanation:

6 0

2 years ago

Are these synthesis decomposition single replacement or double replacement?

marishachu [46]

Answer:

1. Synthesis

2. Decomposition

3. Single replacement

4. Synthesis

5. Decomposition

6. Synthesis

Explanation:

Kind of a hard picture to look at but let me define each chemical reaction:

Synthesis:

a + b ---> ab In synthesis elements/compounds come together to form new compounds

Decomposition:

ab ---> a + b In decomposition a compound breaks down to form 2 elements/compounds

Single replacement:

a + bc ---> b + ac In a single replacement one element/compound takes the place of another element/compound.

Double replacement

ab + cd ---> ad + bc In a double replacement 2 compounds exchange different elements/compounds.

Now, let's go through the assignment

1. P + O2 --> P4O10 This is a synthesis reaction because the two elements (P and O) came together to form one compound.

2. HgO ---> Hg + O2 This is a decomposition reaction because HgO broke into separate elements Hg and O.

3. Cl2 + NaBr ---> NaCl + Br2 This is a single replacement reaction because chlorine (Cl) replaced the spot of bromine (Br) to bond with sodium (Na).

4. Mg + O2 ---> MgO This is a synthesis reaction because two elements (Mg and O) came together to form one compound.

5. Al2O3 ---> Al + O2 This is a decomposition reactions because Al2O3 broke into separate elements Al and O.

6. H2 + N2 ---> NH3 This is a synthesis reaction because two elements (H and N) came together to form one compound.

I hope this helps!!

- Kay :)

7 0

2 years ago