Write the net ionic equation for the precipitation of cobalt(ii) carbonate from aqueous solution

50 g of nitrogen (n2) has a volume of 40 liters at stp.

The question is asking for the volume of 50 g of nitrogen (N2) gas at standard temperature and pressure (STP), which is defined as 0 degrees Celsius and 1 atmosphere of pressure. At STP, one mole of an ideal gas occupies 22.4 liters. First, to find the volume, we need to calculate the number of moles of nitrogen gas we have using its molecular weight (28.0 g/mol):

Number of moles (n) = Mass of N2 (g) / Molecular weight of N2 (g/mol) = 50 g / 28.0 g/mol ≈ 1.786 moles

Now applying the molar volume at STP:

Volume (V) = n (moles) × Molar volume at STP (L/mol) = 1.786 moles × 22.4 L/mol ≈ 40 liters

So, 50 g of nitrogen gas has a volume of approximately 40 liters at STP.

The number of moles of aluminum, sulfur, and oxygen atoms in 4.00 moles of aluminum sulfate, Al₂(SO₄)₃ are 8.00, 12.00, and 48.00, respectively.

Aluminum: There are 2 aluminum atoms in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 2 x 4.00 = 8.00 moles of aluminum atoms.

Sulfur: There is 1 sulfur atom in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 1 x 4.00 = 12.00 moles of sulfur atoms.

Oxygen: There are 12 oxygen atoms in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 12 x 4.00 = 48.00 moles of oxygen atoms.

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1) Balanced chemical reaction: Cl₂ + 2NaI → 2NaCl + I₂.

Chlorine and iodine are diatomic molecules.

2) Balanced chemical reaction: 2NH₃ → N₂ + 3H₂.

Nitrogen and hydrogen are diatomic molecules.

3) Balanced chemical reaction: 4Na + O₂ → 2Na₂O.

Sodium in compounds has oxidation number +1 and oxygen -2.

The element with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4 is Tin (Sn). This is found by adding up the electrons in each part of the configuration.

The electron configuration provided, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4, represents the element Sn, or Tin in the periodic table. The configuration corresponds to the distribution of electrons among different energy levels (shells) and sub-levels in an atom. To identify the element, we add up the electrons represented by each part of the configuration (e.g., s2 implies 2 electrons, p6 implies 6 electrons etc.). We see that the total number of electrons is 50, which corresponds to the atomic number of Tin (Sn) in the periodic table.

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Answer:

Violet

Explanation:

The insects, birds, etc. are called pollinators. Because they help in pollination. The flowers attract birds and insects which aid in the pollination process. The correct option is B.

The process in which the pollen grains are transferred from the anther to the stigma of flowers is defined as the pollination. The agents which are responsible for the pollination are pollinators.

The flowers use scent to attract pollinators. A signal which helps the pollinators to find the particular flower is known as the scent. These floral scents are known to be a complex mixture of highly volatile compounds and essential oils that is emitted by the flowers into the atmosphere.

A flower scent's structure, color, and odor are the important factors which attract the pollinators. Those plants pollinated by bees and flies have sweet scents and those pollinated by beetles have fruity odors.

Thus the correct option is B.

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Final answer:

The activation energy for the reverse reaction of NO2(g) + CO(g) → NO(g) + CO2(g) is 375 kJ/mol. This is calculated using the formula that subtracts the change in enthalpy from the activation energy of the forward reaction.

Explanation:

The activation energy for the reverse reaction can be determined using the concept that the activation energy for a reaction and the activation energy for the reverse reaction must total the energy difference between the reactants and the products, which is given by the change in enthalpy (ΔH). The given forward reaction NO2(g) + CO(g) → NO(g) + CO2(g) has an activation energy (Ea) of 175 kJ/mol and a change in enthalpy (ΔH) of -200 kJ/mol.

To find the activation energy for the reverse reaction, we use the formula:

Activation energy of reverse reaction = Activation energy of forward reaction - ΔH

Plugging in the values we get:

Activation energy of reverse reaction = 175 kJ/mol - (-200 kJ/mol)

This calculation yields an activation energy for the reverse reaction of 375 kJ/mol.

The radiations are released in the radioactive decay along with the heat energy. Thus, option A is correct.

The radioactive atoms are given as the one that has the presence of unstable nuclei. The unstable nuclei have been giving off radiations that form them to attain stability.

The radioactive atoms have been emitting the radiations from the nucleus to become stable, and the nuclear or the radioactive radiations from the radioactive decay.

The decay of the radioactive elements releases the radiations such as alpha, beta, gamma, and other radiations. The decay along with the release of the radiation releases energy.

Therefore, in radioactive decay, the atoms along with the radiations release heat energy. Thus, option A is correct.

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pH is the estimation of the acidity and the basicity of the solution. The pH of the soft drink with buffer ingredients will be 7.218.

pH is the negative logarithm of the hydrogen ion concentration in an aqueous solution.

Moles of sodium dihydrogen phosphate is calculated as:

[tex]\begin{aligned}\rm moles &= \dfrac{6.6}{120} \\\\&= 0.055 \;\rm moles \end{aligned}[/tex]

The molar concentration of dihydrogen phosphate is calculated as,

[tex]\begin{aligned} &= \dfrac{\text{Moles of dihydrogen phosphate}}{\text {Volume }}\\\\&= \dfrac{0.055}{355 \times 10^{-3}}\\\\&= 0.155 \;\rm M\end{aligned}[/tex]

The complete dissociation of monosodium phosphate can be shown as,

[tex]\rm Na_[2}HPO_{4} (aq) \rightarrow 2Na^{+} (aq) + HPO_{4}^{2-} (aq)[/tex]

When 1 mole of monosodium phosphate = 142 g/mol

Then, moles =  0.0563 moles

The molar concentration of dihydrogen phosphate will be:

[tex]\begin{aligned} &= \dfrac{0.0563}{( 355 \times 10^{-3})}\\\\&= 0.1586\;\rm M\end{aligned}[/tex]

The partial dissociation of both the weak acid is given as:

[tex]\begin{aligned}\rm [H^{+}] &= \rm Ka \times \dfrac{([H_{2}PO_{4}^{-}]}{[HPO_{4}^{2-}]}\\\\ &= (6.20 \times 10^{-8}) \times (\dfrac{0.155}{0.1586})\\\\ &= 6.059 \times 10^{-8}\;\rm M \end{aligned}[/tex]

pH can be calculated as:

[tex]\begin{aligned} \rm pH &= \rm - log[H^{+}]\\\\ &= \rm - log (6.059 \times 10^ {-8})\\\\ & = 7.218\end{aligned}[/tex]

Therefore, 7.218 is the pH.

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Answer:

Definetely a double replacement

Explanation:

Answer:

rocks

Explanation:

Answer:

Rocks

Explanation:

Answer:

D. 0.29 L

Explanation:

To calculate the required volume, we can convert the concentration of the solution from M to g/L, keeping in mind the molar mass of H₂SO₄, 98 g/mol :

1.25 [tex]\frac{mol}{L}*\frac{98g}{1mol}=[/tex]122.5 g/L

So a concentration of 1.25 M of H₂SO₄ is the same as a concentration of 122.5 g/L.

Finally we divide 36 grams by the concentration:

[tex]\frac{36g}{122.5g/L}[/tex] = 0.29 L

So your answer was correct, it is option D.

A. A catalyst!!!

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