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3 years ago

How many uL are present in 250 mL of H20? (1 uL = 10^-6 Liters)

Chemistry

1 answer:

Vanyuwa [196]3 years ago

4 0

Answer:

250000 μL

Explanation:

If 1 L = 1000 mL

Then X L = 250 mL

X = (1 × 250) / 1000 = 0.25 L

Now we can calculate the number of microliters (μL) in 0.25 L:

if 1 μL = 10⁻⁶ L

then X μL = 0.25 L

X = (1 × 0.25) / 10⁻⁶ =250000 μL

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9.45 x10^25 molecules

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3 years ago

The following anions can be separated by precipitation as silver salts: Cl- , Br- , I- , CrO4 2-. If Ag is added to a solution c

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Answer:

AgI, AgBr, AgCl and Ag₂CrO₄

Explanation:

Ksp (product solubility constant) is defined as the equilibrium constant of the general reaction:

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Where X is cation and Y is anion.

Ksp = [aXⁿ⁺]ᵃ [nYᵃ⁻]ⁿ

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Replacing in Ksp:

Ksp = [ax]ᵃ [nx]ⁿ

Solving for x, Solubility (S) is defined as:

$S = \sqrt[n+a]{\frac{Ksp}{a^{a} n^n} }$

For AgCl, Ag₂CrO₄, AgBr and AgI solubilities are:

$S = \sqrt[2]{\frac{1.8x10^{-10}}{1} }$ = 1.34x10⁻⁵M

$S = \sqrt[3]{\frac{1.1x10^{-12}}{4} }$ = 6.50x10⁻⁵M

$S = \sqrt[2]{\frac{5.4x10^{-13}}{1} }$ = 7.35x10⁻⁷M

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The lower solubility is the first compound in precipitate, thus, order of precipitation is:

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3 years ago

Consider the following data for five hypothetical elements: Q, W, X, Y, and Z. Rank the elements from most reactive to least rea

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Answer:

Y Q W Z X

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The most reactive element is the element that will displace an element from it compound . The most reactive element will replace the less reactive element in it compound.

Q+ + Y Reaction occurs

Since the reaction occurs the element Y which is more reactive displaced element Q from it compound.

Q+W+ Reaction occurs

The reaction occurs, that means element Q replaces element w from it compound. Element Q is therefore more reactive than element W.

W+Z+ Reaction occurs

The reaction also occurs . This is an indication that element W replaces element Z in it compound. This means element W is very reactive than element Z.

X+Z+ No reaction

There is no reaction here. This is an indication that element X is less reactive than element Z. This is why element X can't displace element Y in it compound.

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3 years ago

How many molecules in 4.10 mol H2O?

Shtirlitz [24]

Answer:

2,47 * $10^{24}$ (molecules)

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Avogadro's number is a very important relationship: 1 mole = 6,02 * $10^{23}$ atoms, molecules, protons, etc.

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4,1 mol * 6,02 * $10^{23}$ ≈ 24,7 * $10^{23}$ = 2,47 * $10^{24}$ (molecules)

Therefore the third answer is correct

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3 years ago

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MgCl2 because it is the only option in which a metal appears with a nonmetal. In this case, the metal transfers electrons to the nonmental because the metal has a lower ionization energy.

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4 years ago

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How many uL are present in 250 mL of H20? (1 uL = 10^-6 Liters)​

How many uL are present in 250 mL of H20? (1 uL = 10^-6 Liters)