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3 years ago

What is physical quantity ? Give examples.

Physics

1 answer:

Dahasolnce [82]3 years ago

7 0

Explanation:

physical quantity is any physical property that can be qualified that,is, be measured using numbers e.g mass, amount of substance,time and length

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Glycerin (C3H8O3) is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 154 g of glycerin to 316 mL o

garri49 [273]

Answer:

$P_{sol}=50.4\ mm.Hg$

Explanation:

According to given:

molecular mass of glycerin, $M_g=3\times 12+8+3\times 16=92\ g.mol^{-1}$

molecular mass of water, $M_w=2+16=18\ g.mol^{-1}$

∵Density of water is $0.992\ g.cm^{-3}= 0.992\ g.mL^{-1}$

∴mass of water in 316 mL, $m_w=316\times 0.992=313.5 g$

mass of glycerin, $m_g=154\ g$

pressure of mixture, $P_x=55.32\ torr= 55.32\ mm.Hg$

temperature of mixture, $T_x=40^{\circ}C$

Upon the formation of solution the vapour pressure will be reduced since we have one component of solution as non-volatile.

moles of water in the given quantity:

$n_w=\frac{m_w}{M_w}$

$n_w=\frac{313.5}{18}$

$n_w=17.42 moles$

moles of glycerin in the given quantity:

$n_g=\frac{m_g}{M_g}$

$n_g=\frac{154}{92}$

$n_g=1.674 moles$

Now the mole fraction of water:

$X_w=\frac{n_w}{n_w+n_g}$

$X_w=\frac{17.42}{17.42+1.674}$

$X_w=0.912$

Since glycerin is non-volatile in nature so the vapor pressure of the resulting solution will be due to water only.

$\therefore P_{sol}=X_w\times P_x$

$\therefore P_{sol}=0.912\times 55.32$

$P_{sol}=50.4\ mm.Hg$

7 0

3 years ago

How do you identify the number of protons in an atom's nucleus from the periodic table?

hodyreva [135]

Answer:

Explanation: BY ATOMIC NUMBER

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2 years ago

Two rollerbladers face each other and stand at rest on a flat parking lot. Tracey has a mass of 32 kg, and Jonas has a mass of 4

satela [25.4K]

Mass of Tracey M1 = 32 kg

Mass of Jonas M2 = 45 kg

Initially both were at rest

so V1i = V2i =0

after pushing each other Jonas speed V2f = 0.80 m/s

we need to find out final speed of Tracy

Here we can use momentum conservation as no external force is acting here

M1V1i + M2V2i = M1V1f + M2V2f

32(0) + 45(0) = 32 V1f + 45(0.80)

0 = 32 V1f + 36

-36 = 32 V1f

V1f = - 1.125 m/s

negative sign shows that Tracy will move opposite to the Jonas

so answer in two significant figure would be

V1f = 1.1 m/s

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3 years ago

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As a car accelerates its tires increase their angular velocity from 114 rad/s to 131 rad/s in 0.43 seconds. What is the angular

e-lub [12.9K]

I think it's 39.53

(please do calculate it. I am not completely sure)

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2 years ago

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What is the speed of a bobsled who's distance-time graph indicates that it traveled 106m in 26s?

swat32

To find the speed of the bobsled, you divide the distance by time. So, when you divide 106 by 26, you get 4.07. This means the speed of the bobsled is about 4 miles per hour.

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2 years ago

What is physical quantity ? Give examples.​

What is physical quantity ? Give examples.