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4 years ago

In which part of the scientific method would you interpret data?

Chemistry

2 answers:

LenKa [72]4 years ago

4 0

The answer is B. Analysis

wariber [46]4 years ago

3 0

The correct answer is: [B]: "analysis" .
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At 20°C the vapor pressure of benzene (C6H6) is 75 torr, and that of toluene (C7H8) is 22 torr. Assume that benzene and toluene

valina [46]

Answer: The mole fraction of benzene will be 0.34 and mole fraction of toluene is 0.66

Explanation:

According to Raoult's law, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the vapor pressure of that component in the pure state.

$p_1=x_1p_1^0$ and $p_2=x_2P_2^0$

where, x = mole fraction in solution

$p^0$ = pressure in the pure state

According to Dalton's law, the total pressure is the sum of individual pressures.

$p_{total}=p_1+p_2\\$ $p_{total}=x_{benzene}p_{benzene}^0+x_{toluene}P_{toluene}^0$

$x_{benzene}=x$ ,

$x_{toluene}=1-x_{benzene}=1-x$ ,

$p_{benzene}^0=75torr$

$p_{toluene}^0=22torr$

$p_{total}=40torr$

$40=x\times 75+(1-x)\times 22$

$x=0.34$

Thus (1-x0 = (1-0.34)=0.66

Thus the mole fraction of benzene will be 0.34 and that of toluene is 0.66

8 0

4 years ago

Calculating kinetic energy 1200kg car moving at 10

valkas [14]

Answer:

60000J

Explanation:

Given parameters:

Mass of car = 1200kg

Speed = 10m/s

Unknown:

Kinetic energy = ?

Solution:

The kinetic energy is given as:

Kinetic energy = $\frac{1}{2}$ m v²

Now insert the parameters and solve;

m is the mass

v is the velocity

Kinetic energy = $\frac{1}{2}$ x 1200 x 10² = 60000J

6 0

3 years ago

How many liters will 451 g of krypton gas occupy at STP

Nonamiya [84]

First divide 451g by kryptons molar mass
451g/84gmol= 5.369047619moles

Then multiply 5.369047619moles by 22.4L(volume 1 mol of a gas occupies at STP)

5.369047619moles x 22.4L= 120.26L

Answer: 120.26L

Hoped this helped to explain molar conversions it can be hard to understand at first but you will get the hang of it

5 0

3 years ago

Indicate whether each of the following compounds will gave an acidic, basic or neutral solution when dissolved in water. Clear A

allsm [11]

Answer: ammonium bromide : acidic : The pH will be less than 7.

potassium cyanide : basic :The pH will be more than 7.

calcium nitrate: neutral : The pH will be approximately equal to 7.

calcium hypochlorite : basic :The pH will be more than 7.

Explanation:

pH is defined as the negative logarithm of hydrogen ion concentration. The scale ranges from 0 to 14.

When a solution is acidic, it will show a pH in the range of 0 - 6.9. When a solution is basic, it will show a pH in the range of 7.1 - 14. When a solution is neutral, it will show a pH of 7.

ammonium bromide : $NH_4Br$ : acidic as it is formed from the combination of strong acid HBr and weak base $NH_4OH$