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grandymaker [24]
3 years ago
7

A metal is electrolyzed from aqueous solution by using an electrical current of 1.23 a for 2.5 hours and 3.37 grams of metal is

deposited. in a separate experiment the number of electrons used for the reduction of the metal is 2. what is the metal
Chemistry
1 answer:
ElenaW [278]3 years ago
3 0
48.0g piece of metal is dropped into 50.0mL of water in a graduated cylinder. The water level rises to 62.4mL.
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Problem Page Cobalt(II) chloride forms several hydrates with the general formula , where is an integer. If the hydrate is heated
steposvetlana [31]

The question has missing information, the complete question is:

Cobalt(II) chloride forms several hydrates with the general formula CoCl₂.xH₂O, where x is an integer. If the hydrate is heated, the water can be driven off, leaving pure CoCl₂ behind. Suppose a sample of a certain hydrate is heated until all the water is removed, and it's found that the mass of the sample decreases by 22.0%. Which hydrate is it? That is, what is x?

Answer:

CoCl₂.26H₂O

Explanation:

The molar masses of the compounds that forms the hydrate are:

Co = 59 g/mol

Cl = 35.5 g/mol

H = 1 g/mol

O = 16 g/mol

The molar mass of CoCl₂ is 130 g/mol and of H₂O is 18 g/mol, thus for the hydrate, it will be 130 + 18x g/mol.

Let's suppose 1 mol of the compound. Thus, the mass of the hydrate is: 130 + 18x, and the mass of CoCl₂ will be 130 g. Because the mass decreassed by 22.0% :

0.22*(130 + 18x) = 130

130 + 18x = 590.91

18x = 460.91

x ≅ 26

Thus, the hydrate is CoCl₂.26H₂O

7 0
4 years ago
Read 2 more answers
Name the following ionic compounds: (a) K2Cr2O7, (b) Li2C2O4, (c) CuNO3.
Elis [28]

Answer :

(a) The name of K_2Cr_2O_7 is, potassium dichromate.

(b) The name of Li_2C_2O_4 is, lithium oxalate.

(c) The name of CuNO_3 is, copper nitrate.

Explanation:

Ionic compound : It is a type of compound that is made up of the ions of the two different elements in which one element is a metal and another element is a non-metal.

(a) K_2Cr_2O_7

The given compound K_2Cr_2O_7 is an ionic compound. It is made up of two different ions which are potassium ion (K^+) and dichromate ion (Cr_2O_7^{2-}).

So, the name of K_2Cr_2O_7 is, potassium dichromate.

(b) Li_2C_2O_4

The given compound Li_2C_2O_4 is an ionic compound. It is made up of two different ions which are lithium ion (Li^+) and oxalate ion (C_2O_4^{2-}).

So, the name of Li_2C_2O_4 is, lithium oxalate.

(c) CuNO_3

The given compound CuNO_3 is an ionic compound. It is made up of two different ions which are copper ion (Cu^+) and nitrate ion (NO_3^{-}).

So, the name of CuNO_3 is, copper nitrate.

4 0
3 years ago
PLEASE HELP!! I have to pass this class! Anything!!
Georgia [21]

Answer:

We'll have 8.0 moles Fe3O4 and 4.0 moles CO2

Explanation:

Step 1: data given

Number of moles Fe2O3 = 12.0 moles

Number of moles CO = 12.0 moles

Step 2: The balanced equation

3Fe2O3 +CO → 2Fe3O4 + CO2

Step 3: Calculate the limiting reactant

For 3 moles Fe2O3 we need 1 mol CO to produce 2 moles Fe3O4 and 1 mol CO2

Fe2O3 is the limiting reactant. It will completely be consumed (12.0 moles).

CO is in excess. There will react 12.0 / 3 = 4.0 moles

There will remain 12.0 - 4.0 = 8.0 moles

Step 4: Calculate moles products

For 3 moles Fe2O3 we need 1 mol CO to produce 2 moles Fe3O4 and 1 mol CO2

For 12.0 moles Fe2O3 we'll have 2/3 * 12.0 = 8.0 moles Fe3O4

For 12.0 moles Fe2O3 we'll have 12.0 / 3 = 4.0 moles CO2

We'll have 8.0 moles Fe3O4 and 4.0 moles CO2

6 0
3 years ago
Carbohydrates make up 75% of the mass of dried plant material. Cotton is at least 95% carbohydrate. Why do humans not include co
Darina [25.2K]

Answer:

the carbohydrates in cotton are mainly cellulose, but our body does not possess the proper enzymes to process cellulose, no we don't eat cotton on in our daily diet.

4 0
3 years ago
If 842 grams of sodium hydroxide reacts with 750.0 grams of aluminum, how many grams of aluminum hydroxide should theoretically
Phantasy [73]

548.55 grams of aluminum hydroxide should theoretically form.

Explanation:

Balanced equation for the reaction:

3 NaOH + Al ⇒ Al(OH)3 +3 Na

DATA GIVEN:

mass of NaOH = 842 grams, atomic mass =39.9 grams/mole

mass of Al = 750 grams, atomic mass = 26.9 grams/mole

aluminum hydroxide theoretical yield = ?

Moles of NaOH reacted

number of moles = \frac{mass}{atomic mass of 1 mole}

putting the values in the equation

NaOH = \frac{842}{39.9}

           = 21.1 MOLES OF NaOH

Al = \frac{750}{26.9}

   = 27.8 moles

from the equation

 from 3 moles of NaOH 1 mole of Al(OH)3 is produced

21.1 moles of NaOH will react to give x moles of Al(OH)3

\frac{1}{3} = \frac{x}{21.1}

7.03 moles of Al(OH)3 is formed.

and

1 mole of Al(OH)3 is formed from 1 mole of Al in the reaction

so, 27.8 Moles will react to give give 27.8 moles of Al(OH)3 limiting reagent of the given reaction is NaOH

mass of Al(OH)3 =7.03 x 78 (atomic mass of Al(OH)3)

          = 548.55 grams

theoretical  yield from the given data is 548.55 grams

3 0
3 years ago
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