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2 years ago

Which statements describe lattice energy?

1 answer:

5 0

Answer:

It is the energy the ions absorb when they form a crystalline compound.

Explanation:

Lattice energy is the energy released upon the formation of a crystal lattice structure.

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A lead cylinder has a mass of 540 grams and a density of 2.70 g/ml. What is its volume

ch4aika [34]

Volume = Mass / Density

Volume = 540g / 2.70 g/ml

Volume = 200 ml

3 0

2 years ago

Read 2 more answers

The standard curve was made by spectrophotographic analysis of equilibrated iron(III) thiocyanate solutions of known concentrati

posledela

Answer:

Molar concentration of the Fe³⁺ in the unknown solution is 8.01x10⁻⁵M.

Explanation:

When you make a calibration curve in a spectrophotographic analysis you are applying the Lambert-Beer law that states the concentration of a compound is directely proportional to its absorbance:

A = E*l*C

<em>Where A is absorbance, E is molar absorption coefficient, l is optical path length and C is molar concentration</em>

<em />

Using the equation of the line you obtain:

y = 4541.6X + 0.0461

<em>Where Y is absorbance and X is concentration -We will assume concentration is given in molarity-</em>

As absorbance of the unknown is 0.410:

0.410 = 4541.6X + 0.0461

X = 8.01x10⁻⁵M

<h3>Molar concentration of the Fe³⁺ in the unknown solution is 8.01x10⁻⁵M.</h3>

<em />

6 0

2 years ago

What is the name of the following ionic compound?: MoAs

Minchanka [31]

Molybdenum Arsenide

I think that’s right but not %100 sure

3 0

2 years ago

How many atoms of S are in 98.0 grams of hydrosulfuric acid?

noname [10]

<h2>Answer: $6.022\times 10^{23}$ </h2>

Explanation:

The formula for sulphuric acid is $H_{2}SO_{4}$ .

Molecular mass of sulphuric acid is $2(2)+32+16(4)=98g$

$given weight=98g$

Number of moles of sulphuric acid given is $\frac{\text{given weight}}{molar mass}$ = $\frac{98}{98}=1$

The formula indicates that one mole of $H_{2}SO_{4}$ contains $2$ moles of $H$ atoms, $1$ mole of $S$ atoms, $4$ moles of $O$ atoms.

So,the compound contains $1$ mole of sulphur atoms.

$1$ mole of sulphur has $6.022\times 10^{23}$ atoms

7 0

2 years ago

Calculate the hydroxide ion concentration [oh-] for human urine (ph = 6.2). notice this is about hydroxide.

igomit [66]

[OH⁻] = 1.6 × 10⁻⁸ mol / dm³

<h3>Explanation</h3>

By definition, $[\text{H}^{+}] = 10^{-\text{pH}}$ , where $[\text{H}^{+}]$ is the concentration of proton in the solution.

pH = 6.2 for this solution. As a result, $[\text{H}^{+} = 10^{-6.2} = 6.31 \times 10^{-7} \; \text{mol} \cdot \text{dm}^{-3}$ .

$[\text{H}^{+}] \cdot [\text{OH}^{-}] = \text{K}_w$ , where $[\text{OH}^{-}]$ the concentration of hydroxide ions and $\text{K}_w$ is the dissociation constant of water.

$\text{K}_w = 10^{-14} \; \text{mol}\cdot \text{dm}^{-3}$ at 0.10 MPa and 25 °C. As a result, $[\text{OH}^{-}] = \text{K}_w / [\text{H}^{+}] = 10^{14} / (6.31 \times 10^{-7}) = 1.6 \times 10^{-8} \; \text{mol}\cdot \text{dm}^{-3}$ .

5 0

2 years ago