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3 years ago

PLEASE HELP! WILL AWARD BRAINLIEST

Chemistry

1 answer:

salantis [7]3 years ago

4 0

Answer:

The answer for number one is (a)

The answer for number 2 is (b)

Explanation:

#1. Mass/volume=density

#2. The solution is basic and a solute is sugar so in order for it to be basic you would have had to add the sugar to something acidic, and with the ratio of the solute to solution the acidity is 3.8

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A cubic box with sides of 20.0 cm contains 2.00 × 1023 molecules of helium with a root-mean-square speed (thermal speed) of 200

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1.133 kPa is the average pressure exerted by the molecules on the walls of the container.

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Volume of the box ,V= $s^3$

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$\mu=\sqrt{\frac{3kN_AT}{M}}$

where,

= root mean square speed

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T = temperature = 370 K

M = mass helium = $3.40\times 10^{-27}kg/mole$

$N_A$ = Avogadro’s number = $6.022\times 10^{23}mol^{-1}$

$T=\frac{\mu _{rms}^2\times M}{3kN_A}$

Moles of helium gas = n

Number of helium molecules = N = $2.00\times 10^{23}$

N = $N_A\times n$

Ideal gas equation:

PV = nRT

Substitution of values of T and n from above :

$PV=\frac{N}{N_A}\times R\times \frac{\mu _{rms}^2\times M}{3kN_A}$

$PV=\frac{N\times R\times \mu ^2\times M}{3k\times (N_A)^2}$

$R=k\times N_A$

$PV=\frac{N\times \mu ^2\times M}{3}$

$P=\frac{2.00\times 10^{23}\times (200 m/s)^2\times 3.40\times 10^{-27} kg/mol}{3\times 8\times 10^{-3} m^3}$

$P=1133.33 Pa =1.133 kPa$

(1 Pa = 0.001 kPa)

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