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2 years ago

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A sprinter set a high school record in track and field, running 200.0 m in 21.3 s. What is the average speed of the sprinter in

kilometers per hour?

1 answer:

Taya2010 [7]2 years ago

3 0

Answer:

33.8km/h

Explanation:

average speed=dostance traveled/time

200/21.3=9.39 m/s

1m/s=3.6km/h

33.8km/h

please give brainliest

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All rocks follow the same pathway though the rock cycle us a false statement. Why?

sammy [17]

False.

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Hope this helps!

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3 years ago

The vapor pressure of a system at equilibrium

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Answer: The vapor pressure or equilibrium vapor pressure is defined as the pressure exerted by a vapor that is in thermodynamic equilibrium with the condensed phase (solid or liquid) at a given temperature in a closed system. The equilibrium vapor pressure is an indication of the evaporation rate of a liquid.

Explanation:

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3 years ago

A tetrahedral molecule has ___ regions of high electron density around the central atom. these molecules have central atoms with

shtirl [24]

<span>The answer is "A tetrahedral molecule has 4 regions of high electron density around the central atom. These molecules have central atoms with 0 lone pairs and 4 atoms bonded to them." Based on the octet rule, the atom must have 8 electrons to become stable. As a result, the molecule will not have lone pairs.</span>

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4 years ago

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A gas diffuses 1/6 times faster than hydrogen gas (H2). What is the molar mass of the gas? 59.95 g/mol 66.54 g/mol 68.68 g/mol 7

taurus [48]

Solution us here,

let the rate of diffusion of H2(r1) be x and⁷ the rate of diffusion of gas(r2) be x+x/6=7x/6.

Molar mass of H2 (M1)=2 g

Molar mass of gas(M2)= ?

Now, from the Ghram's law of diffusion of gas,

$\frac{r1}{r2} = \sqrt{ \frac{m2}{m1} } \\ or \: \frac{x}{ \frac{7x}{6} } = \sqrt{ \frac{m2}{2} } \\ or \: \frac{6}{7} = \sqrt{ \frac{m2}{2} } \\ squaring \: in \: both \: sides \\ \frac{36}{49} = \frac{m2}{2} \\ or m2 = 1 .469$

here, it looks like I have done wrong.

But all of the answers in option are wrong.

Because, rate of diffusion of any gas is inversely proportional to the square root of its malor mass.

And in the question, gas has higher rate of diffusion than hrdrogen. So it should have molar mass less than hydrogen.

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4 years ago

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Lina20 [59]

Explanation:

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Cumulated diene is the one that contains two double bonds on a single atom. This means it has two double bonds continuously.

Isolated double-bonded compound has a single bond isolated by two to three single bonds.

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For example:

$-CH_2=CH-CH=CH2-$

It is a conjugated diene.

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3 years ago