02/01/19

What is the mole fraction of KCl in a solution containing 5.00 moles of KCl and 75.0 moles of H2O
What is the mole fraction of KCl in a solution containing 5.00 moles of KCl and 75.0 moles of H2O
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02/01/19

Chemistry question!! Please help!
Determine how many liters 8.93 g of carbon dioxide gas would occupy at the following conditions. A) STP____ LB) 110 C and 1.00 atm ______ L C) 237 K and 147 kPa______ L
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02/01/19

A 3.09 L flask is filled with propane gas (C3H8) at 1.00 atm and -16.4 C. What is the mass of the propane in the flask?
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02/01/19

Air trapped in a cylinder fitted with a piston occupies 120.8 mL at 1.08 atm pressure. What is the new volume when the piston increased 25%
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01/23/19

conversion units

Electric companies use an energy unit called a kilowatt-hour (KWHR) to measure your electric usage and generate your electric bill. If your house uses an average of 46 KWHR every day and the... more
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01/23/19

Conversion units

A healthy human heart pumps about 70 ml of blood into the aorta with each beat. If the heart is beating at an average of 72 beats/minute, how many gallons of blood does it pump around your body in... more
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01/23/19

Conversion units

A well pump in a nursery provides 35 gallons of water per minute to a sprinkler system. If the sprinklers are on 6 hours per day, how many liters per year does the system use?
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01/23/19

conversions units
The toilets in a college bathroom each use 3.8 liters of water per flush. If there are 6 toilets and they are each flushed an average of 17 times per day, how many gallons of water are used per month? more
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01/22/19

A bicycle completed the first 400.0 m of a ride in 69.2 s. What was the bicycle's average speed in kilometers per hour?
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01/22/19

How many molecules of oxygen are needed to react with 8.87 grams of C3H8?
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01/14/19

How many grams of oxygen are required to react with 11.0 grams of octane (C8H18) in the combustion of octane in gasoline?
How many grams of oxygen are required to react with 11.0 grams of octane (C8H18) in the combustion of octane in gasoline?
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01/06/19

pressure, temp, volume, moles

What is the pressure, in mmHg, of a 4.00 g sample of O2 gas, which has a temperature of 30.0 °C, and a volume of 3000 mL?A) 0.788 mmHgB) 1.04 mmHgC) 78.0 mmHgD) 7880 mmHgE) 788... more
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12/21/18

Carbon burns in the presence of oxygen to give carbon dioxide. Which chemical equation describes this reaction?
carbon + oxygen + carbon dioxidecarbon + oxygen → carbon dioxidecarbon dioxide → carbon + oxygen carbon dioxide + carbon → oxygen
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12/21/18

What kind of chemical reaction does the chemical equation sodium + chlorine → sodium chloride represent?
CombustionDecompositionSingle ReplacementSynthesis
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12/19/18

In naming a binary molecule, the number of atoms of the second element present in the molecule is always indicated by using what?
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12/19/18

If you have 20kg of water at 100°C, how much ice (in kilograms) would you have to add to that water in order to bring the temperature down to 30°C?
I tried using the equation Q=mc∆T, but I keep on running into the roadblock where I can't find ∆T of the ice (the problem doesn't state the initial temperature of the ice). Any help would be... more
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12/19/18

The density of an object that has a mass of 2.50 g and occupies a volume of 1.20 mL equals
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12/19/18

the density of nitrogen gas is 1.17g/L what is the density of nitrogen expressed in micrograms / deciliter (ug/dL)
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12/16/18

How many numbers of moles Ca+2 in 1000 mg of CaCO3.?
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12/14/18

What would be the final temperature of the system if 27.4 g of lead at 120 ◦C is dropped into 22.4 g of water at 12.4 ◦C in an insulated container? The specific heat of lead is 0.128 J/g ◦C.
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12/14/18

HELP PLEASE I HAVE AN EXAM TOMORROW!!!
A foul-smelling gas produced by the reaction of HCl with Na2Swas collected, and a 1.00 L sample was found to have a mass of 1.52 g at STP.Part AWhat is the molecular mass of the gas?
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12/13/18

The sum of two consecutive numbers is 73 ? What are the numbers

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12/10/18

MULTIPLE CHOICE
The volume of a dry gas is 4.00 L at 15°C and 745 torr. What volume will the gas occupy at 40°C and 700 torr?a. 3.46 Lb. 3.92 Lc. 4.08 Ld. 4.63 L
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12/09/18

A rectangular rug has a perimeter of 460 meters. The width of the rug is five meters more than 4 times the length
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12/09/18

Chemistry Homework Help
An NaoH solution was prepared by diluting 3.00 mL of a 20.0 M NaOH stock solution to a final volume of 500 mL. What is the molarity of the new solution?
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