08/21/18

Help my fellow classmates with this question please
A sample of refrigeration gas has a volume of 405 mL at a pressure of 1.50 atm and a temperature of 28°C.The gas was compressed into a volume of 130 mL with a pressure of 3.8 atm. What temperature... more
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08/21/18

Help my fellow classmates with this question please
At constant temperature and pressure, 1.25 mol of hydrogen gas occupies 28 L at STP. What amount of hydrogen gas must be removed from the volume to become 11.2 L at STP? a) 0.13 molb) 0.25 molc)... more
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08/21/18

Which of the following statements is (are) correct?
I. The volume of a gas is inversely proportional to its pressure. II. The pressure of a gas is inversely proportional to its absolute temperature III. The volume of a gas is directly proportional... more
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08/21/18

What volume of oxygen gas at STP is required to react with 10g of potassium metal according to the following equation?
2K(s)+O2(g)=K2O(s)
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08/21/18

At constant temperature and pressure, 1.25 mol of hydrogen gas occupies 28 L at STP.
What amount of hydrogen gas must be removed from the volume to become 11.2 L at STP?   a) 0.13 mol b) 0.25 mol c) 0.50 mol d) 0.75 mol e) 1.00 mol   Is it c) I'm unsure 
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08/21/18

Calculate the molar mass of a compound if 10.05 g of a gas occupies 1.20 L at 29.2°C and 1.1 atm.
Help is appreciated! 
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08/21/18

Some commercial drain cleaners use a mixture of sodium hydroxide and aluminum powder.
When the solid mixture is poured into the drain and dissolves, a reaction ensues that produces hydrogen gas:2NaOH(aq) + Al(s) + 6H2O(l) → 2NaAl(OH)4(aq) + 3H2(g)   Determine the volume of... more
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08/21/18

A gas cylinder contains 50.0 L of the gas argon when it is full
If the cylinder was at an internal pressure of 1500 kpa and 25ºC, how many molecules of argon gas were present in the container?
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08/21/18

The head of a match contains the chemical diphosphorus trisulfide.
When this chemical undergoes friction it ignites and burns according to the equation given below:   P2S3(s) + 11/2 O2(g) -> P2O5(g) + 3SO2(g)   WHAT MASS OF P2S3 WOULD PRODUCE 310 ML OF... more
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08/21/18

Thanks for your help
Ammonia can be reacted with carbon dioxide to form urea, as shown below. If 170 g ammonia were consumed in a reaction with excess carbon dioxide, what mass of urea could be produce?  The molar... more
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08/21/18

C7H6O3 + CH3COOH —> C9H8O4 + H2O
C7H6O3 + CH3COOH —> C9H8O4 + H2OThe above reaction between salicylic acid (C7H6O3) and acetic acid shows the synthesis of aspirin (C9H8O4). If the percent yield of the reaction is 33.3% then... more
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08/20/18

Calculate the percent error if the experimental value for the density of zinc is 9.95 g/cm3. The accepted value is 7.13 g/cm3.
show work
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08/20/18

For a fieldtrip 4 students ride in cars and the rest filled 9 buses how many students were in each bus if 472 students were on the trip
For a fieldtrip 4 students ride in cars and the rest filled 9 buses how many students were in each bus if 472 students were on the trip
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08/20/18

I am having trouble finding out the correct equation.
Chris is four years older than Belle. Doug is five years younger than twice Belle's age. The sum of their ages is 47. How old is each child?
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08/20/18

When 500 mL of a gas at constant pressure is heated from 25°C and 75°C, the volume must be multiplied by
a) 25/75   b) 75/25   c) 25/75 * 298/348   d) 348/298   e) 298/348
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08/20/18

The length of a rectangle is four times its width. If the area of the rectangle is 256 in2 , find its perimeter.
The length of a rectangle is four times its width. If the area of the rectangle is 256 in2, find its perimeter.
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08/20/18

A stray dog ate 28 of your muffins. That was 4/5 of all of them. With how many did you start.
A stray dog ate 28 of your muffins. That was 4/5 of all of them! With how many did you start?
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08/20/18

315 miles on 17.5 gallons of gas in highway driving. How many gallons will it take to drive 1749 miles? how far can she drive on 140 gallons of gas?
315 miles on 17.5 gallons of gas in highway driving. How many gallons will it take to drive 1749 miles? how far can she drive on 140 gallons of gas?
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08/20/18

lisa studies 2hours and scores 75% how many hours does she have to study to get 93%
lisa studies 2hours and gets a score of 75%, how many hours would she have to study to get a score of 93?
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08/20/18

chemistry question?
4Al + 3O₂ → 2Al₂O₃How does 4Al+3O₂ turn into 2Al₂O₃? WHat type of dividing is going on? Shouldn't it be 4Al3O₂? (the original problem was to make Al+O₂ into a balaced equation, and I understood it... more
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08/20/18

Chemistry question!!!
Give the complete balanced equation for the reaction that occurs when magnesium chlorate (Mg(ClO3)2) is heated. You do not need to make the subscripts smaller in your answer; just write them out as... more
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08/20/18

Skeletal structure of organic compounds
What are the skeletal structure of following compoundsA) CH3CH2C(CH2)2CH3B) C(CH3)3(CH2)3CH3
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08/19/18

Vince wants to make a square patio in his yard. He has enough concrete to pave an area of 130 square feet. How long can a side of his patio be?
how long can a side be?
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08/19/18

An assistant receives a 7% raise, bringing the salary to 45,877$ what was the salary before the raise?
an assistant recevies a raise, bringing the salary to $45,877. What was the salary before the raise?
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08/19/18

What price should you sell the car?
Dad asked you to sell his luxury car. He wants you end up with $51,000, but you have to pay 15% of the selling price due to taxes for luxury cars. What price should you sell the car? Compose... more
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