4 years ago

Help me please.. dont understand

1 answer:

4 0

When gases get cooler the molecules slow down or lose energy and condense so the volume in the tire or soccer ball would decrease and may feel flatter

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The molecular weight of table salt, NaCI, is 58.8 g/mol. A tablespoon of salt weighs 6.37 grams. Calculate the number of moles o

svetlana [45]

6.37/ 58.5= .108888889
Since it had 3 sig figs the answer is 0.109

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3 years ago

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A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car?

Olegator [25]

Speed =distance/time
speed =150km/7200s
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3 years ago

An unknown sample weighing 0.3512g was added to 20.0 mL of cyclohexane. The density of cyclohexane is 0.779g/mL, and the freezin

rjkz [21]

Explanation:

It is known that density is mass of a substance divided by its volume.

Mathematically, Density = $\frac{mass}{volume}$

Therefore, calculate the mass of cyclohexane as follows.

mass of cyclohexane = Density × volume

= $0.779 g/mL \times 20 mL$

= 15.58 g

or, = 0.01558 kg (as 1 kg = 1000 g)

As, K_{f} of cyclohexane = $20^{o}C/m$

$\Delta T_{f} = K_{f} \times molality$

$5.2 = 20 \times molality$

molality = $\frac{5.2}{20}$

= 0.26 m

Also, molality is the number of moles of solute present in kg of solvent.

Mathematically, molality = $\frac{\text{no. of moles}}{\text{mass of solvent}}$

0.26 = $\frac{\text{no. of moles}}{0.01558}$

No. of moles = $4.05 \times 10^{-3}$

As, No. of moles = $\frac{mass}{\frac{molar mass}}$

$4.05 \times 10^{-3} = \frac{0.3512}{\text{molar mass}}$

molar mass = 87.0 g/mol

Thus, we can conclude that molar mass of unknown substance is 87.0 g/mole.

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3 years ago

Who was the first hispanic justice of the United States Supreme Court

ale4655 [162]

Justice Sonia Sotomayor<span> is the first Latina to sit on the United States Supreme Court.</span>

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4 years ago

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A block is pulled 0.90 m to the right in 2.4 s. What is the block's average speed to the nearest hundredths of a m/s?

Len [333]

I just need points sorry

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3 years ago