03/23/21

In the reaction represented by the equation 2C2H6 + 7O2 → 4CO2 + 6H2O, what is the mole ratio of water to oxygen?
In the reaction represented by the equation 2C2H6 + 7O2 → 4CO2 + 6H2O, what is the mole ratio of water to oxygen?
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03/23/21

chemistry help pls
What is the difference in volume between A) 4.705 g of carbon monoxide at 349 K and B) the same mass of carbon dioxide at 581 K if they are both at 90.1 kPa?
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03/23/21

chemistry help pls
A 0.813 g sample of sulfur hexafluoride gas at 25oC occupies a volume of 0.616 L, what is the pressure in torr?
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03/23/21

How many grams of Oxygen are there in 15 g of sodium bicarbonate?
Sodium bicarbonate (NaHCO3) is commercially known as baking soda.         (Molar mass of NaHCO3 = 84.01 g/mol) 
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03/22/21

If you start with 4.50 grams of Magnesium (Mg), how many grams of Hydrogen gas (H2) will you theoretically produce? If you actually produce 0.25 grams, what is your percent yield?
Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)
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03/22/21

What is the full ground-state electron configuration of the monatomic ion most likely to be formed by Br?
I got 1s22s22p63s23p63d104s24p6 but it is incorrect.
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03/22/21

Please help for my Chemistry class
An ideal gas occupying a 2.0 L flask at 760 torr is allowed to expand to a volume of 6L. Calculate the final pressure in atm. A gas occupies a volume of 400 mL at a pressure of 3.3 atm. At what... more
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03/22/21

For the reaction ?C6H6+ ?O2 -> ?CO2 + ?H2O 47.6 grams of C6H6 are allowed to react with 136.8 grams of O2. How much CO2 will be produced by this reaction? ( answer in grams)
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03/21/21

Calculate the number of grams of oxygen
In the presence of UV light, hydrogen peroxide, H2O2(l), decomposes to liquid water and oxygen gas. Calculate the number of grams of oxygen gas that can be made when 2.364 grams of hydrogen... more
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03/21/21

Use the following reaction: 2KClO3 -> 2KCl + 3O2 If 5.0g of KClO3 is decomposed, how many grams of KCl are produced?
Make sure you show work to get credit.
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03/21/21

Calculate the number of moles
When potassium chlorate, KClO3(s), is heated, it decomposes to solid potassium chloride and oxygen gas. Calculate the number of moles of oxygen gas that can be made when 0.626 moles of potassium... more
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03/21/21

please help on this chemistry homework i need help ASAP PLEASE HELP thank youuuuu so much
It takes 55.0  to raise the temperature of an 11.4  piece of unknown metal from 13.0 to 24.3 . What is the specific heat for the metal?Express your answer with the appropriate units.
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03/21/21

A sample of Kr in a 72.861 L metal cylinder at 128.62 kPa has its temperature changed from 365.42 K to 392.32 K while its volume is simultaneously changed by a piston to 5.765 L. What is the final p
A sample of Kr in a 72.861 L metal cylinder at 128.62 kPa has its temperature changed from 365.42 K to 392.32 K while its volume is simultaneously changed by a piston to 5.765 L. What is the final... more
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03/21/21

A sample of SO2 experiences a change in pressure from 497.15 kPa to 456.72 kPa. During this change, the temperature is also changed from 991.51 K to 522.4 K. If its new volume is 31.176 L, what was i
A sample of SO2 experiences a change in pressure from 497.15 kPa to 456.72 kPa. During this change, the temperature is also changed from 991.51 K to 522.4 K. If its new volume is 31.176 L, what... more
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03/21/21

A sample of He in a metal container at 534.19 kPa has its temperature changed from 226.08 K to 192.6 K. What is the final pressure in kilopascals?
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03/21/21

A sample of N2O experiences a change in volume from 71.723 L to 3.569 L. If its new pressure is 425.38 kPa, what was its original pressure in kilopascals?
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03/21/21

A 20.54 L sample of O3 experiences a change in pressure from 558.96 kPa to 965.69 kPa. What is the resulting volume in liters?
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03/21/21

Calculate the number of grams
Sulfur trioxide gas can be synthesized by the reaction of sulfur dioxide gas and oxygen gas. Calculate the number of grams of sulfur trioxide gas that can be made by reacting 15.7 grams of sulfur... more
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03/21/21

A certain ore is 36.3 % nickel by mass. How many kilograms of this ore would you need to dig up to have 20.0 g of nickel?
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03/20/21

Can someone please check-over these to see if I got the correct answers?
In the following questions, an unbalanced equation is given. Balance the equation. Then add up the coefficients on both sides of this properly balanced equation and identify the total. (My answer... more
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03/20/21

Can someone pease help me with this question?
Which statement about the relative densities of the phases of H2O is true?A. Steam and ice have the same density.B. Liquid water and ice have the same density.C. Liquid water is denser than ice.D.... more
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03/20/21

If 96 g of the mixture are prepared, what amount (in grams) of each chemical is needed?
In a chemical mixture, 3 g of chemical A are used for each gram of chemical B, and 4 g of chemical C are needed for each gram of B. If 96 g of the mixture are prepared, what amount (in grams) of... more
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03/20/21

How many moles of H2SO4 are needed to react with an equivalent of NaOH to produce 165 moles of sodium sulfate?
2 NaOH + H2SO4 → Na2SO4 + 2 H2OI know the answer is 82.5 but I don't understand how to get there.
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03/20/21

The temperature of a sample of Br2 is changed without changing its volume, causing a change in pressure from 602.12 kPa to 762.15 kPa. If the starting temperature was 449.46 K, what is the final temp

The temperature of a sample of Br2 is changed without changing its volume, causing a change in pressure from 602.12 kPa to 762.15 kPa. If the starting temperature was 449.46 K, what is the final... more
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03/20/21

For the reaction ? C6H6 + ? O2 → ? CO2 + ? H2O 39.4 grams of C6H6 are allowed to react with 103.4 grams of O2. How much CO2 will be produced by this reaction? Answer in units of grams.
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