04/26/18

A sample of a gas at 0.5 atm pressure and 25 OC occupies a volume of 2.0 L. What pressure is necessary to cause the gas to occupy 0.5 L at same temperature?
please help me Homework in science for Grade 10 students
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04/26/18

what is the resulting Δtf of the solution? PLEASEEEE HELP
A solution is made by dissolving 23.5 grams of glucose (C6H12O6) in 0.245 kilograms of water. If the molal freezing point constant for water (Kf) is -1.86 °C/m, what is the resulting Δtf of the... more
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04/26/18

Flue gas problem solving needed
Hi,   Can anyone help me with these excercises.   The car consumes benzine 8 liters per 100km (8l/100km). How to calculate 80 km journey's exhaust fumes total mass.    Benzine's density is... more
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04/26/18

Acidification of urea solution.
What does "acidification of urea solution by using Nitric acid to pH 1" mean?
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04/25/18

Hess's Law Problem. PLEASE HELP
Use Hess’s Law to calculate the enthalpy of combustion for ethane gas, C2H6 given the following data:C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (g) ΔH = -1323 kJ/mole C2H4 (g) + H2 (g) → C2H6 (g) ΔH =... more
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04/25/18

according to the following reaction, how many grams of water are necessary to form 0.772 moles phosphoric acid
According to the following reaction, how many grams of water are necessary to form 0.772 moles phosphoric acid?diphosphorus pentoxide (s) + water (l) ------->phosphoric acid (aq)
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04/25/18

volume of a 0.143 M sodium hydroxide is required to neutralize 19.5ml of a 0.127 M Hydrochloric
What volume of a 0.143 M sodium hydroxide solution is required to neutralize 19.5 mL of a 0.127 M hydrochloric acid solution?_____mmL sodium hydroxide
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04/25/18

what is the theoretical yield of phosphoric acid and what is the percentage yield of phosphoric acid
For the following reaction, 4.43 grams of tetraphosphorus decaoxide are mixed with excess perchloric acid (HClO4). The reaction yields 5.37 grams of phosphoric acid.perchloric acid (HClO4) (aq) +... more
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04/25/18

N2+H2=NH3 what properties does it contain
This topic is about physical science and I need help answering this question
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04/25/18

Somebody Help me Please
what is the delta g for the following reaction at 298 k? 2C6H6(l)+12H2(g)+3O2(g)=>6C2H6O(l)
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04/25/18

What affects the atom economy
I need help with this question
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04/25/18

What's the correct molecular formula?
Element analysis reveals that a 270.469g sample, which corresponds to 15.01771 moles, contains 30.2763g of H, What is the correct molecular formula? i have tried everything from multiplying by... more
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04/25/18

calculate the molarity of 1270g of K2PO4 in 4.0 L aqueous solution
i do not know how to d0 it at all help
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04/24/18

When 10 grams of hydrogen gas is burned with oxygen gas, it produces 18 grams of water. This is a chemical change.
Based upon conservation of mass, how much oxygen gass was used
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04/24/18

What is the freezing point of this solution?
A solution is made by dissolving 54g of C2H6O2 in 215g H2O. Freezing point depression constant for water is 1.86 degrees C kg/mol
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04/24/18

What is the final volume of the KOH solution?
35.5 mL of a 33% (m/v) KOH solution is diluted with water to give a 7.5% (m/v) KOH solution
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04/24/18

How many grams of solid barium sulfate are produced when 150mL of a 1.15M sulfuric acid
is reacted with 75mL of a 3.00M barium iodide solution?
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04/24/18

zinc metal reacts with aqueous hydrochloric acid to produce hydrogen gas and zinc (II) chloride.
Zn(s) + 2HCI(aq)=H2(g)+ZnCl2(g)   How many mL of 1.67M HCI solution are needed to completely react 11.5g ofZn?
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04/24/18

how many mL of a 0.350 M LiOH solution contains 0.0171moles of LiOH
how do you get started, with what formula? 
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04/24/18

An object weighing 9.6 g is placed in a graduated cylinder displacing the volume from 10.0 ML to 13.2 ML What is its density in g/mL i got 3.0 Now its asking w
Help  me
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04/24/18

queston in description
Tire pressure gauges measure the pressure inside a tire that is in excess of atmospheric pressure. That is, the gauge pressure is the total pressure minus the atmospheric pressure. If the... more
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04/24/18

An automobile tire has an inside presuure of 50.0 psi and is cooled from 20C to 0C. What is the new pressure?
need help solving 
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04/24/18

queston in description
A balloonist puts 1.25 X 105 L of air into her hot air balloon at 25C and atmospheric pressure. The air is heated to 200C at constant pressure. What is the volume of air in the balloon at this... more
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04/24/18

A 0.25- liter ballon at 75F is places in a freezer at -10F. What is its new volume?
I need help working this out
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04/24/18

What is the concentration of the vial after reconstitution
A 2-g antibiotic vial states “Reconstitute with 8.6 mL of sterile water for a final volume of 10 mL.” What is the concentration of the vial after reconstitution?
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