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3 years ago

How long would it take a train to travel 500 miles at 25 mph?

2 answers:

6 0

The rate of speed you're doing is 250 miles every hour. So in 1 hour you will travel 250 miles, and in 2 hours you will travel 2(250) = 500 miles. So it will take you 2 hours to travel 500 miles if you're going 250 mph. :)

The famous equation to remember here is d = st where d = distance, and s = speed and t = time. So if you put 500 for d and 250 for s, you are just solving for t which in this case is hours. 500 = 250t.

Hope that helps!

faust18 [17]3 years ago

3 0

Answer:

2 or 3 hrs

I think

<h2>HOPE IT HELPED </h2>

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Drupady [299]

What amount of heat absorbs 50 g of steel (ce = 0.115 cal / g. ° C) that

does its temperature vary by 25 ° C?

Answer:

143.75cal

Explanation:

Given parameters:

Mass of steel = 50g

Specific heat capacity of the steel = 0.115cal/g°C

Temperature = 25°C

Unknown:

Amount of heat = ?

Solution:

The amount of heat to cause this temperature change is dependent on mass and specific heat capacity of the substance.

Amount of heat = m C (ΔT)

m is the mass

c is the specific heat capacity

ΔT is the temperature change

Now insert the parameters and solve;

Amount of heat = 50 x 0.115 x 25

Amount of heat = 143.75cal

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2 years ago

What is the number of moles in 500L of He gas at STP

kompoz [17]

Ah, this is actually a fairly simple chemistry question.

Recall that at STP, one mole is equivalent to 22.4 L. Knowing this, all you have to do is divide 500 L by 22.4 L to find the number of moles:

500/22.4 = 22.3 mol

-T.B.

7 0

3 years ago

An aqueous CsCl solution is 8.00 wt% CsCl and has a density of 1.0643 g/mL at 20°C. What is the boiling point of this solution?

umka2103 [35]

<u>Answer:</u> The boiling point of solution is 100.53

<u>Explanation:</u>

We are given:

8.00 wt % of CsCl

This means that 8.00 grams of CsCl is present in 100 grams of solution

Mass of solvent = (100 - 8) g = 92 grams

The equation used to calculate elevation in boiling point follows:

$\Delta T_b=\text{Boiling point of solution}-\text{Boiling point of pure solution}$

To calculate the elevation in boiling point, we use the equation:

$\Delta T_b=iK_bm$

Or,

$\text{Boiling point of solution}-\text{Boiling point of pure solution}=i\times K_b\times \frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ (in grams)}}$

where,

Boiling point of pure solution = 100°C

i = Vant hoff factor = 2 (For CsCl)

$K_b$ = molal boiling point elevation constant = 0.51°C/m

$m_{solute}$ = Given mass of solute (CsCl) = 8.00 g

$M_{solute}$ = Molar mass of solute (CsCl) = 168.4 g/mol

$W_{solvent}$ = Mass of solvent (water) = 92 g

Putting values in above equation, we get:

$\text{Boiling point of solution}-100=2\times 0.51^oC/m\times \frac{8.00\times 1000}{168.4g/mol\times 92}\\\\\text{Boiling point of solution}=100.53^oC$

Hence, the boiling point of solution is 100.53

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3 years ago

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Gelneren [198K]

Answer:

C - raising the temperature of a gas

Explanation:

as you raise temperature, kinetic energy rises, and so does pressure

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inysia [295]

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