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3 years ago

3[8 + (4 + 2)] =========

Chemistry

2 answers:

liberstina [14]3 years ago

3 0

Answer:

Explanation:

3[8 + (8)]

3[16]

sleet_krkn [62]3 years ago

3 0

Answer:

Explanation:

The answer is 42

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Tpy6a [65]

Answer:

the left one

Explanation:

heavier means it goes faster

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3 years ago

Is chex mix an example of a pure substance or mixture?

irinina [24]

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3 years ago

Given the molar absorptivity for a species X of 1600 M-1cm-1 at a wavelength of 270 nm, and 400 M-1cm-1 at a wavelength of 540 n

Andre45 [30]

Answer:

Explanation:

From the given information:

At wavelength = 270 nm

$\varepsilon x_1 = 1600 \ m^{-1} \ cm^{-1} \\ \\ \varepsilon y_1 = 200 \ m^{-1} \ cm^{-1}$

At 270 nm

Suppose x is said to be the solution for the concentration of x and y to be the solution for the concentration of y;

Then:

$\varepsilon x_1 \ l + \varepsilon y_1 \ l= 0.5 \\ \\ A = A_1 + A_2$

$1600 xl + 200 yl= 0.5$

Divide both sides by 200

$8xl + yl = \dfrac{0.5}{200}$

$8x + y = \dfrac{0.5}{200}l$

Use l = 1cm (i.e the standard length)

Then;

$8x + y = \dfrac{0.5}{200} ---- (1)$

$\varepsilon x_2 x \ l + \varepsilon y_2 y \ l= 0.5 \\ \\ 40 xl + 800 yl = 0.5$

$x + 20 y = \dfrac{0.5}{400 \ l}$

since l = 1

$x + 20 y = \dfrac{0.5}{400 \ } --- (2)$

Equating both (1) and (2) together, we have:

$8x + y - 8x - 160 y = \dfrac{0.5}{200} - \dfrac{0.5 \times 8}{400} \\ \\ \implies - 159 y = \dfrac{0.5}{200} ( 1 - \dfrac{8}{2}) \\ \\ -159 y = \dfrac{-0.5 \times 3}{200} \\ \\ 159 \ y = 0.0075 \\ \\ y = \dfrac{0.0075}{159} \\ \\ y = 0.00004716 \\ \\ y = 4.7 \times 10^{-5 } \ M$

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3 years ago

PLEASEEE HELPPPPP

Len [333]

Hi my dear friend,

Because we must add heat, boiling water is a process that chemists call endothermic. Clearly, if some processes require heat, others must give off heat when they take place. ... Changes of state involve a solid melting, a liquid freezing, a liquid boiling or a gas condensing.

~Thank you

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3 years ago

Read 2 more answers

What is the result of multiplying 2.5 × 10^10 by 3.5 × 10-^2

LUCKY_DIMON [66]

$2,5*10^{10}*3,5*10^{-2}=8,75*10^{10+(-2)}=8,75*10^{8}$

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4 years ago

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3[8 + (4 + 2)] =========