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son4ous [18]
2 years ago
12

Prior to their phaseout in the 1980s, chemicals containing lead were commonly added to gasoline as anti-knocking agents. a 2.475

g sample of one such additive containing only lead, carbon, and hydrogen was burned in an oxygen rich environment. the products of the combustion were 2.694 g of co2(g) and 1.378 g of h2o(g). insert subscripts below to appropriately display the empirical formula of the gasoline additive:
Chemistry
1 answer:
KiRa [710]2 years ago
8 0
4.007-2.694 g of CO2 = 2.694 x 12 / 44 g of C = 0.7347 g of C = 0.0911 moles of C 2.050-1.378 g of H2O = 2.050 x 2 / 18 g of H = 0.1531 g and 0.1531 moles mass of Pb = 2.475 - ( 0.0911 + 0.1531) g = 2.23 g = 2.23 / 207 = 0.0108 moles 
molar ratio of C:H:Pb = 0.0911: 0.1531: 0.0108divide by the smallest number and we get 8.0: 20.0: 1.0 
empirical formula is C8H20Pb 
tetraethyl lead
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stepan [7]
Burning Mg in the air and reacting with O2 forming a white powder of MnO

So the equation is going to be:
Mn + O2 ⇒ MnO (this equation is not conserved)

to make it equilibrium:
1- First we should put 2Mno to equal the O2 on both sides.
So it will be:
Mg + O2⇒ 2MgO
2- Second we should put 2Mn to equal the Mn on both sides.
2Mg + O2⇒ 2MgO (this equation is conserved)
After putting the physical states the final equilibrium equation is going to be:
                        Δ
2Mg(s) + O2(g)⇒ 2MgO(s)

 

4 0
3 years ago
The quantity, q grams, of the radioactive isotope strontium-90 present in a sample decreases by half over a period of about t =
velikii [3]
Notice q=3/2, is half of the original q = 3(<span>1/2</span>)<span>t/28.8
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8 0
2 years ago
Read 2 more answers
A sample of ice is heated continuously until it becomes a liquid, and then a gas. Its temperature is recorded throughout and a g
padilas [110]

Answer:

The answer to your question is: C. The specific latent heat of fusion

Explanation:

A. The specific latent heat of vaporization  Specific latent heat of vaporization indicates the transition from liquid to vapor, but we are not looking for this definition. This answer is wrong.

B. The specific heat indicates the amount of heat needed to increase the temperature of water 1°C, so this answer is wrong.

C. The specific latent heat of fusion . This heat indicate the transition from solid ie to liquid, so this is the right answer.

D. The internal energy measures the energy of the molecules of a substance, so this answer is wrong.

3 0
3 years ago
Consider a 1260-kg automobile clocked by law-enforcement radar at a speed of 85.5 km/h. If the position of the car is known to w
-BARSIC- [3]
The expected speed is v = 85.5 km/h
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If there is an uncertainty of 2 meters in measuring the position, then within a 1-second time interval:
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The upper measurement for the speed is v₂ = 25.75 m/s.
The range of variation is
Δv = v₂ - v₁ = 4 m/s

The uncertainty in measuring the speed is
Δv/v = 4/23.75 = 0.1684 = 16.84%

Answer: 16.8%
3 0
2 years ago
How many moles in Co are there in 6 billion Co atoms
nasty-shy [4]
Hello there!

<span> Use Avogadro's number, 1 mol = 6.02 x 10^23 atoms. 
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<span>9.97x10^(-15) moles Co
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Hope This Helps You!
Good Luck :)
3 0
3 years ago
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