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4 years ago

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Question 4

1 answer:

Otrada [13]4 years ago

8 0

Answer:

la respuesta es a.another pureza substance

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Lucy got a new car for her birthday so she went 12 km east and then 8 km South. What is her distance

melamori03 [73]

21 south I think i dum

3 0

3 years ago

The fe2+(aq) solution described in part a was produced by dissolving 4.05 g of ore in acid. what was the percentage of fe by mas

poizon [28]

Percentage by mass is the amount in mass of a component in a mixture per 100 unit of mass of the total mixture. Percentage by mass is the same as %w/w. In order to determine this value, we need to know the mass of the substance in question and the total mass of the sample. In this case, we have to know the mass of Fe by doing certain calculations. Then, we divide this value by the total mass given of the ore, 4.05 g and multiply by 100%. It should be expressed as follows:

Percent by mass = mass of Fe in ore / 4.05 g ore sample x 100

However, the question is lacking some information so we cannot really specify the answer.

5 0

4 years ago

Read 2 more answers

How many significant figures are in

Softa [21]

The correct answer would be B: 4.

6 0

2 years ago

Write the Lewis structure for ethanol (CH3CH2OH), the alcohol found in alcoholic beverages, then answer the following questions:

hodyreva [135]

Answer :

(1) The number of valence electrons present in the compound is, 20

(2) The number of bonded electrons present in the compound is, 16

(3) The number of lone pair electrons present in the compound is, 4

(4) The number of single bonds present in the compound is, 8

Explanation :

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

The given molecule is, $CH_3CH_2OH$

As we know that carbon has '4' valence electrons, hydrogen has '1' valence electrons and oxygen has '6' valence electrons.

Therefore, the total number of valence electrons in $CH_3CH_2OH$ = 2(4) + 6(1) + 6 = 20

According to Lewis-dot structure, there are 16 number of bonding electrons and 4 number of non-bonding electrons or lone pair of electrons.

The Lewis-dot structure of $CH_3CH_2OH$ is shown below.

8 0

3 years ago

The gas law for an ideal gas at absolute temperature T (in kelvins), pressure P (in atmospheres), and volume V (in liters) is PV

Sophie [7]

Answer:

The rate of change of T with respect to time is 0.40 K/min

Explanation:

The gas law equation is:

$PV = nRT$

We can find the rate of change of T with respect to time by solving the above equation for T and derivating with respect to time:

$\frac{dT}{dt} = \frac{d}{dt}(\frac{PV}{nR})$

$\frac{dT}{dt} = \frac{1}{nR}(V\frac{dP}{dt} + P\frac{dV}{dt})$

Where:

n: is the number of moles = 10 mol

R: is the gas constant = 0.0821

V: is the volume = 13 L

P: is the pressure = 8.0 atm

dP/dt: is the variation of the pressure with respect to time = 0.13 atm/min

dV/dt: is the variation of the volume with respect to time = -0.17 L/min

Hence, the rate of change of T is:

$\frac{dT}{dt} = \frac{1}{10*0.0821}(13*0.13 - 8.0*0.17) = 0.40 K/min$

Therefore, the rate of change of T with respect to time is 0.40 K/min

I hope it helps you!

5 0

3 years ago