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4 years ago

What is a material that contains three elements joined in a fixed proportion

Chemistry

1 answer:

zepelin [54]4 years ago

5 0

If a material contains three elements joined in a fixed proportion, it is a(an) _____.

d.) compound

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At a certain temperature the rate of this reaction is second order in SO3 with a rate constant of 1.18·M-1s-1 :2SO3(g)--> +2S

sergejj [24]

Answer:

Explanation:

For second order reaction

dC / dt = -k C²

dC /C² = - kdt

Integrating on both sides,

[- 1/C ] = - kt + P , P is a constant .

When t =0 , C = 1.33 M

P = - 1 / 1.33

[- 1/C ] =- - kt - 1 / 1.33

When t = 8.5

[- 1/C ] = - kt - 1 / 1.33

= - 1.18 x 8.5 - 1 / 1.33

= - 10.03 - .7519

= - 10.782

C = .0927 M

= .093 M

8 0

3 years ago

Find the ratio v/cv/c for an electron in the first excited state (n = 2) of hydrogen.

dezoksy [38]

The answer is 0.365:100.

v/c ratio represents ratio of speed of an electron (v) to the speed of light (c).

How is the speed of an electron calculated?

The speed of an electron (v) is given by Bohr's model as-

$v =\frac{1}{n}\; \frac{e^{2}}{4\pi \varepsilon _{0}}\times \frac{2\pi }{h}$

Now, for the first excited state, n = 2.

e - Charge of electron = $1.6$ × $10^{-19}$ C

h - Plank's constant = $6.6$ × $10^{-34} J.s$

ε₀- permittivity $= 8.85$ × $10^{-12}$ $N^{-1}.C^{2}.m^{-2}$

Put the above data in the formula-

$v =\frac{1}{2}\; \frac{e^{2}}{4\pi \varepsilon _{0}}\times \frac{2\pi }{h} =\frac{1}{4}\times \frac{(1.6\times 10^{-19})^{2}}{8.85\times 10^{-12}\times 6.6\times 10^{-34}}\\ \\ =0.01096\times 10^{8} \\ \\=1.096\times 10^{6}ms^{-1}$

Now, the speed of light, c = $3.0$ × $10^{8}\ m/s$

Thus, the v/c ratio for an electron in the first excited state is calculated as-

$\frac{v}{c} =\frac{1.096* 10^{6}\ m/s }{3.0 *10^{8}\ m/s }$ = $\frac{0.365}{100}$

Hence, the v/c ratio = 0.365:100.

To learn more about the speed of an electron (v), visit:

brainly.com/question/13198566

#SPJ4

6 0

2 years ago

A 2.50 moles sample of nitrogen gas has a volume of 5. 50L at a temperature of 27C calculate the pressure of the nitrogen gas

Goshia [24]

Answer: 11.18atm

Explanation:Please see attachment for explanation

4 0

3 years ago

Who would most likely be required to work with sodium hydroxide?

GenaCL600 [577]

A plumber- Sodium hydroxide is cleaner and plumbers clean

3 0

4 years ago

Read 2 more answers

The anesthetic procaine hydrochloride is often used to deaden pain during dental surgery. the compound is packaged as a 10.% sol

vichka [17]

10% solution means= $\frac{10g}{100mL}$

= $\frac{0.1g}{1mL}$

= 100 mg/mL

If the dentist inject 0.3 mL, that is equal to 0.3× 100 mg.

If the dentist inject 0.3 mL, that is equal to 30 mg.

So, as anesthetic procaine hydrochloride is often used to deaden pain during dental surgery. the compound is packaged as a 10.% solution (by mass; d = 1.0 g/ml) in water. When our dentist injects 0.30 ml of the solution, 30 mg of procaine hydrochloride (in milligrams) is injected.

6 0

4 years ago