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3 years ago

What is the chemical name of the compound K2SO4? Use the list of polyatomic ions and the periodic table to help you answer.

Chemistry

2 answers:

Inga [223]3 years ago

8 0

Answer: Option (B) is the correct answer.

Explanation:

The given compound is $K_{2}SO_{4}$ , that is, it contains potassium $(K^{+})$ and sulphate $(SO^{2-}_{4})$ ions.

Charge on a sulphate ion is -2 and charge on two potassium ions is +2. Therefore, according to cross multiplication method it results in the formation of $K_{2}SO_{4}$ .

Thus, we can conclude that chemical name of the compound is potassium sulfate.

Ket [755]3 years ago

6 0

potassium sulfate or A because K2 is potassium and SO4 is sulfate

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Nitrogen dioxide is a red-brown gas responsible for the brown color of smog. A container of nitrogen dioxide that is at low pres

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Answer:

Initially $1.51\times 10^{-2} moles$ of nitrogen dioxide were in the container .

Explanation:

Volume of the container at low pressure and at room temperature = $V_1=3.4 L$

Number of moles in the container = $n_1$

After more addition of nitrogen gas at the same pressure and temperature.

Volume of the container after addition = $V_2=5.11 L$

Number of moles in the container after addition= $n_2=2.28\times 10^{-2} mol$

Applying Avogadro's law:

$\frac{Volume}{Moles}=constant$ (at constant pressure and temperature)

$\frac{V_1}{n_1}=\frac{V_2}{n_2}$

$n_1=\frac{V_1\times n_2}{V_2}=\frac{3.4 L\times 2.28\times 10^{-2} mol}{5.11 L}$

$n_1=1.51\times 10^{-2} mol$

Initially $1.51\times 10^{-2} moles$ of nitrogen dioxide were in the container .

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3 years ago

What is the quantity of atoms in KMnO4 ?

tankabanditka [31]

Answer:

Potassium permanganate has a molar mass of 158.04 g/mol. This figure is obtained by adding the individual molar masses of four oxygen atoms, one manganese atom and one potassium atom

Explanation:

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If a neutral atom of chlorine has 17 electrons and 18 neutrons, how many protons does it have?

IceJOKER [234]

17, to be neutral it has to have equal number of protons and electrons

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4 years ago

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hi, can you check if my answers are correct? I'm not so confident in this topic (topic: Classifying Types of Chemical Reactions)

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