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3 years ago

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Chemistry

1 answer:

Reika [66]3 years ago

8 0

Answer:

There will be 525.2 grams of K3N produced

Explanation:

Step 1: Data given

Number of moles of potassium oxide ( K2O) = 6 moles

Magnesium nitride (Mg3N) = in excess

Molar mass of K3N = 131.3 g/mol

Step 2: The balanced equation

Mg3N2 + 3K2O → 3MgO + 2K3N

Step 3: Calculate moles of K3N

The limiting reactant is K2O.

For 1 mol Mg3N2 consumed, we need 3 moles of K2O to produce 3 moles of MgO and 2 moles of K3N

For 6 moles K2O we'll have 2/3 * 6 = 4 moles of K3N

Step 4: Calculate mass of K3N

Mass of K3N = moles K3N * molar mass K3N

Mass of K3N = 4 moles * 131.3 g/mol

Mass of K3N = 525.2 grams

There will be 525.2 grams of K3N produced

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Read the given equation. 2Na + 2H2O → 2NaOH + H2

Crank

Answer:

B) 12.9 grams.

Explanation:

How many moles of molecules in that 6.30 L of H₂?

The volume of one mole of an ideal gas at STP (0 °C, 1 atm) is 22.4 liters.

(The volume of that one mole of gas at STP will be 22.7 liters if STP is defined as 0 °C and 10⁵ Pa).

$\displaystyle n(\text{H}_2) = \frac{6.30\;\text{L}}{22.4\;\text{L}\cdot\text{mol}^{-1}} = 0.28125\;\text{mol}$ .

How many moles of Na will be needed?

The coefficient in front of Na in the equation is twice the coefficient in front of H₂. It takes two moles of Na to produce one mole of H₂.

$n(\text{Na}) = 2\;n(\text{H}_2) = 2\times 0.28125= 0.5625\;\text{mol}$ .

What's the mass of that many Na atoms?

Refer to a modern periodic table. The molar mass of ₁₁Na is 22.990. The mass of one mole of Na atoms is 22.990 gram. The mass of 0.5625 moles of Na atoms will be

$m = n\cdot M = 0.5625 \times 22.990 = 12.9\;\text{g}$ .

(2 sig. fig. as in the volume of the H₂ gas.)

6 0

3 years ago

6. At a glance, it appears like the law of

Mamont248 [21]

Energy and mass equivalence

Explanation:

The law of conservation of energy does not apply to nuclear reactions, the law of conservation of mass-energy makes more sense in this regard.

In nuclear reactions mass is transformed into energy. Therefore, it does not conform with the law of conservation of energy.

According to the law of conservation of energy "energy is neither created no destroyed but they are transformed from one form to another. "
In nuclear reactions, mass is usually lost. Mass is not conserved.
But, the mass is converted into energy and we say there is mass and energy equivalence for nuclear reactions.

Learn more:

Chemical laws brainly.com/question/5896850

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3 years ago

Write the chemical equation for the reaction that occured when you added naoh solution to the nah2

marishachu [46]

<span>CH3COOH + NaOH = CH3COONa +H2O</span>

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3 years ago

8. The reason water is polar is because A. in polar molecules atoms share electrons evenly. B. the electrons spend more time cir

pentagon [3]

Answer: option B happens to be correct since we can somewhere say that the electron density is more near oxygen atom which leads to polarization of bond and development of bond.

Explanation:

The reason why the water molecule is polar is due to the electronegativity difference between the Oxygen and hydrogen atoms.

Oxygen is more electronegative than hydrogen and hence the covalent bond formed between oxygen and hydrogen would be polarized . Since the oxygen is more electronegative than hydrogen so more electron density would remain around oxygen. Due to the bond polarity partial positive and negative charges would develop on the atoms.

Hydrogen would develop a partial positive charge since it is losing its electron density to more electronegative oxygen atom.

Oxygen would develop a partial negative charge as it is gaining electron density from hydrogen due to its more electronegativity.

The development of partial charges on account of polarity differences in polar molecules are not at all complete electron transfer.The bonds are still covalent in nature and the electrons are shared among atoms but just because one of the atoms is more electronegative so it is having more amount of electron density .

Out of the given options option B happens to be correct since we can somewhere say that the electron density is more near oxygen atom which leads to polarization of bond and development of bond.

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Explanation:

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3 years ago