Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0011 %Pb by mass. How much of the water (in mL) contains 160 mg of Pb? (Assume a density of 1.0 g/mL.)

It should be noted that to calculate Kf for t butyl alcohol, we need to calculate molality.

Your information is incomplete as the figures are not given. Therefore, an overview will be given. To calculate Kf for t butyl alcohol, we need to calculate molality.

Molality will be calculated as:

= mass of solute / (molar mass of solute × mass of solvent)

For example, if the solution has a molality of 0.455 that freezes at 3.17 degrees Celsius, then Kf would be equal to 3.17 divided by 0.455 which is 6.96 degrees Celsius.

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The ΔG for the reaction shown is -11.76 kJ/mol.

The equilibrium constant is a value that shows the extent to which reactants are converted to products in a reaction. We have to first obtain the equilibrium constant as follows;

K = (0.750)^2/(0.160) (0.100) = 35

Now;

Using the formula;

ΔG = -RTlnK

ΔG = -(8.314 × 398 × ln 35)

ΔG = -11.76 kJ/mol

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Answer:

1.8x10_24 moleclues

Explanation:

because you have to divide the numbers  and then times them together

750 x 14,0067 u = 10,505.025 g

Answer:

( essay ) a time when i got lost somewhere

Answer:

3 significant figures

Explanation:

Thus 2° C, converts to 275 K, which has 3 significant figures. Rounding Error When you do a long series of calculations, try to do them all in one set of operations.

Answer:

The maximum number of valence electrons is 8

Explanation:

element 3 has 3 valence electrons. 7 has 5, and 10 has 8, as we increased the number of electrons in element 11, the number of valence electrons became 3, and the pattern went on, it cannot exceed 8.

The electron configuration of an atom depicts the arrangement of electrons scattered throughout the orbital shells and subshells.

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#SPJ2

From what we know, we can confirm that the difference measured by the experiment in the heat released when compared to the hydrogenation of an imaginary cyclohexatriene is called the stabilization energy of benzene.

This is a term used to describe the difference in measured energy of a chemical structure compared to the theoretical energy amounts expected to be measured. In this experiment, the heat that was released did not match the calculated energy expected, which is a prime example of stabilization energy at work.

Therefore, we can confirm that the difference measured by the experiment is called the stabilization energy of benzene.

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Answer:

58.92 g EDTA

Explanation:

315.1 mL = .3151 L    

M = Moles / Liter

.3151 L  x 0.5 mol EDTA  x  374 g EDTA  =  58.92 g EDTA

                1 L EDTA             1 mol EDTA

The amount in grams of EDTA needed to make 315.1 mL of a 0.05 M is equal to 5.89 g.

In a 0.05M solution, there are 0.05 moles of the substance per 1 liter, that is, in 315.1 ml we have:

                                        [tex]\frac{0.05 mol}{xmol}= \frac{1000ml}{315.1ml}[/tex]

                                           [tex]x = 0.016 mol[/tex]

Thus, 0.016 mol EDTA of  is needed to prepare the solution.

To calculate the mass in an amount of moles, we use the molar mass, so that:

                                          [tex]m = MM \times mol[/tex]

                                         [tex]m = 374 \times 0.016[/tex]

                                             [tex]m = 5.89 g[/tex]

So, the amount in grams of EDTA needed to make 315.1 mL of a 0.05 M is equal to 5.89 g.

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what's up? i don't think D words it that well, but i would think it's D since none of the other answers make sense

Answer:

so you can give it

Explanation:

This problem is providing us with the mass equivalent to one troy ounce. Thus, the troy ounces of gold in one short ton of average Nevada ore is required and found to be the 0.103 otz according to the following dimensional analysis.

In chemistry, a raft of problems do not always provide an equation in order to be solved yet dimensional analysis can be applied, so as to obtain the desired amount in the required units.

Thus, since this problem asks for try ounces in an average Nevada ore,  which has 3.2 grams of gold per short ton of ore, one can solve the following setup in order to obtain the required answer in otz:

[tex]\frac{3.2gAu}{1short-ton}*1short-ton*\frac{1otz}{31.1g} \\[/tex]

Where the short tons are cancelled out as well as the grams, in order to obtain:

[tex]0.103 otz[/tex]

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Answer:

is 5509.12

Explanation:

creo que es eso no se lo siento

Answer:

the sum of average kinetic molecules of the body is called temperature..

The heat of reaction is the quantity of heat absorbed or emitted in a reaction.

The heat of reaction is the quantity of heat absorbed or emitted in a reaction. This question is incomplete hence the numerical value of the heat of reaction can not be determined.

However, the heat of reaction is determined from the mass of the reactants, the temperature change in the calorimeter and the number of moles of the limiting reactant.

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Answer:

received 2 electrons

Explanation:

Since a neutrally charged oxygen has 8 electrons (-) and 8 protons (+), an oxygen ion with a charge of -2 and would have 10 electrons.

[tex]\bold{\huge{\orange{\underline{ Solution}}}}[/tex]

[tex]\bold{\underline{ Given :- }}[/tex]

[tex]\bold{\underline{ To \: Find :- }}[/tex]

[tex]\bold{\underline{ Let's \:Begin:- }}[/tex]

We know that,

Amount of heat energy = mass * specific heat * change in temperature

That is,

[tex]\sf{\red{ Q = mcΔT }}[/tex]

Subsitute the required values in the above formula :-

[tex]\sf{ Q = 250 × 4.180 ×(0 - 100 )}[/tex]

[tex]\sf{ Q = 250 × 4.180 × - 100 }[/tex]

[tex]\sf{ Q = 250 × - 418}[/tex]

[tex]\sf{\pink{ Q = - 104,500 J }}[/tex]

Hence, 104,500 J of heat is released to cool 250 grams of liquid water from 100° C to 0° C.

[tex]\bold{\underline{ Now :- }}[/tex]

We have to tell whether the above process is endothermic or exothermic :-

Here, In the above process ΔT is negative and as a result of it Q is also negative that means above process is Exothermic

C to D

Explanation:

it rises faster between those two points

Based on the mass ratio of reactants, 23.5 g of sodium nitrate is produced from the reactants.

The mass ratio of a reaction is the ratio of the masses of reactants wilhich combine to form products.

The mass of sodium nitrate is determined from the mass ratio.

The equation of the reaction gives the mass ratio as follows:

NaCl + AgNO3 ----> AgCl + NaNO3

Molar mass of NaCl = 58.5 g

Molar mass of AgNO3 = 170 g

Molar mass of AgCl = 143.5

Molar mass of NaNO3 = 85 g

There are 98 grams of sodium chloride, 47 grams of silver nitrate, therefore silver nitrate is the limiting reactant.

47 grams of silver nitrate will produce 85/170 × 47 = 23.5 g of sodium nitrate.

Therefore, 23.5 g of sodium nitrate is produced from the reactants.

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The balanced equation is:

4 NO(g) + O₂(g) ⇒ 2 N₂O₃(g)

The expression of the rate in terms of change in concentrations are:

[tex]v = \frac{-\Delta [NO]}{4\Delta t } = \frac{-\Delta [O_2]}{1\Delta t } = \frac{\Delta [N_2O_3]}{2\Delta t }[/tex]

When N₂O₃ is forming at 0.221 M/s, NO is disappearing at 0.442 M/s.

The reaction rate is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time.

4 NO(g) + O₂(g) ⇒ 2 N₂O₃(g)

We will need to consider the stoichiometric coefficient of each species.

[tex]v = \frac{-\Delta [NO]}{4\Delta t } = \frac{-\Delta [O_2]}{1\Delta t } = \frac{\Delta [N_2O_3]}{2\Delta t }[/tex]

The molar ratio of NO to N₂O₃ is 4:2.

[tex]\frac{0.221molN_2O3}{L.s} \times \frac{4molNO}{2molN_2O_3} = \frac{0.442 molNO}{L.s}[/tex]

The balanced equation is:

4 NO(g) + O₂(g) ⇒ 2 N₂O₃(g)

The expression of the rate in terms of change in concentrations are:

[tex]v = \frac{-\Delta [NO]}{4\Delta t } = \frac{-\Delta [O_2]}{1\Delta t } = \frac{\Delta [N_2O_3]}{2\Delta t }[/tex]

When N₂O₃ is forming at 0.221 M/s, NO is disappearing at 0.442 M/s.

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Answer:

Air conditionded building

Explanation: Ice cream is processed food so techniacally it could be using technology but Air conditioning is a unit of metal and is built. Hope this is right!

Answer:

5 feet 6 inches is the optimal height for a human

Answer:

where are the following organisms

The atom that has the smallest diameter will have the greatest electron attraction, so the electrons will be difficult to escape

So atom R will lose its electron most reluctantly

Answer:

farther apart; increasing

Explanation:

The particles in a liquid are less tightly packed together so an increase in pressure makes the particles in a liquid get farther apart.