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lisabon 2012 [21]
3 years ago
5

What is the formula for CO3 2- and Al3+ ?

Chemistry
2 answers:
Goryan [66]3 years ago
7 0

Answer is: formula is Al₂(CO₃)₃.

Aluminium carbonate (Al₂(CO₃)₃) has neutral charge. Because aluminium cation has positive charge 3+ and carbonate anion has negative charge 2-, for right chemical formula, we need two aluminium cations and three carbonate anion:

charge of the molecule = 2 · (3+) + 3 · (-2).

charge of the molecule = 0.

blsea [12.9K]3 years ago
5 0
The formula for the given above is obtained by cross multiplying the charges of the given set of atoms. The element with a positive value for the charge should be written first. This may be shown through the formula,
                                     Al2(CO3)2.
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<span>Data:

1) molar mass: 58.0714 g.

2) mass analysis

C: 18 g
H: 3 g
O: 8 g.

Solution
</span>
<span>What is the percent composition of all the components in the liquid?

mass of C + mass of H + mass of O = 18g + 3g + 8g = 29 g

Percent composition:

C: (18g / 29g) * 100 = 62%

H: (3g / 29g) * 100 = 10%

O: (8g / 29g) * 100 = 28%
                               --------------
           Total               100%

What is the empirical formula of the compound?

Convert masses to number of moles by dividing each mass by the atomic mass of the correspondant element:

C: 18 g/ 12.0 g/mol = 1.5 mol

H: 3 g / 1.0 g/mol = 3 mol

O: 8 g / 16 g/mol = 0.5 mol

Divide each number of moles by the smaller, i.e. 0.5 mol

=> C: 1.5 mol / 0.5 mol = 3 mol
=> H: 3 mol / 0.5 mol = 6 mol
=> O: 0.5 mol / o.5 mol = 1 mol

=> Empirical formula: C3 H6 O

What is the molecular formula of the unknown liquid?

First,calculate the molar mass of the empirical formula:

C3 H6 O => 3 * 12 g/mol + 6*1 g/mol + 16 g/mol = 58 g/ mol

Secont, given that the molar mass is the same that the empirical mass, the molecular formula is the same empirical formula.

=> Molecular formula = C3 H6 O.

This compound has been identified as a ketone.

Go online and figure out the name of this compound.

It is easy to find that this compound is propanone or acetone (both names are valid).

Now you can go online and find its  characteristics and common uses.

Can you identify the killer from this information? How?

Likely they think you can presume that the killer is the actress, because women use acetone regularlty to remove the nail polish.
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3 years ago
What is the pressure of 1.27 L of a gas at 288°C, if the gas had a volume of 875 ml at
lyudmila [28]

The pressure of 1.27 L of a gas at 288°C, if the gas had a volume of 875 ml at 145 kPa and 176°C is 1.195 atm.

<h3>What is ideal gas equation?</h3>

Ideal gas equation of any gas will be represented as:
PV = nRT, where

P = pressure

V = volume

n = moles

R = universal gas constant

T = temperature

First we calculate the moles of gas, when the volume of gas 875 ml at

145 kPa and 176°C as:

n = (1.431atm)(0.875L) / (0.082L.atm/K.mol)(449.15K)

n = 1.252 / 36.83 = 0.033 moles

Now we measure the pressure of 0.033 moles of gas of 1.27 L of a gas at 288°C as:

P = (0.033mol)(0.082L.atm/K.mol)(561K) / (1.27L) = 1.195 atm

Hence required pressure of gas is 1.195 atm.

To know more about ideal gas equation, visit the below link:
brainly.com/question/555495

#SPJ1

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