466 Answered Questions for the topic AP chemistry

#### Can you help me with this phase change thermochemistry problem?

How do I calculate how much heat energy is required to hear a 150g sample of ice initially At -14°C to 30°C?.
I know that I am supposed to use the equation q=mcΔT at some point, but I am not...
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#### Can you teach me how to solve this Head's Law problem?

Given the following data, calculate the change in enthalpy for this reaction.
2NH3+3N2O==>4N2+3H20 (change in enthalpy-1010kJ)
N2O+3H2===>N2+H4+H2O ( change in enthalpy...
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#### What steps so I need to use to solve this Head's Law problem?

The enthalpy of combustion of solid carbon to form carbon dirs ide is -393.7 kJ/mol carbon, and the enthalpy of combustion carbon monoxide to form carbon dioxide is-283.3 kJ/mol. Use this data to...
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#### Can you help me with this calorimetry problem?

In a coffe cup calorimeter, 50.0mL of 0.100M of AgNO3 and 50mL of 0.100M HCl are mixed to yield the following reaction:
Ag+ (aq) + Cl -==> AgCl(s)
The two solutions were initially at...
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#### What steps do I need to do to complete this AP chemistry problem?

A 5.00g sample of aluminum pellets (specific heat=0.89 J/g°C) and a 10.00g sample of iron pellets (specific heat 0.45 J/g°C) are heated to 100.0 °C. The mixture of hot iron and aluminum is then...
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#### Can you help me with this enthalpy problem?

Consider the reaction:
2H2+O2==>2H2O (change in enthalpy -572J)
A. How much heat is evolved for the production of 1.00 mol H2O?
B. How much heat is evolved when 186g O2 is reacted with...
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#### Can you help me with this problem on enthalpy

For the reaction 4Fe+3O2==>2FeO3 (change in enthalpy=-1652)
A. How much heat is released when 4.00 mol iron is reacted with excess O2?
B. How much heat is released when 1.00 mol Fe2O3 is...
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#### I am struggling with this thermochemistry reaction problem

For the the reaction:
4Fe+3O2==>2Fe2O3 delta H = -1652kJ
A. How much heat is released whem 4.00mol iron is reacted with excess O2?
B. How much heat is released when 1.00mol of iron is...
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#### I am struggling with this AP Chemistry Problem

A balloon filled with 39.9 mol of helium was a volums of 876 L at 0.0°C and 1 atm. The temperature of the balloon increased from 38.0°C as it expands to a volume of 998L, the pressure remaining...
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#### Can you help me with this heat energy problem?

As a system increases in volume, it absorbs 52.5J of energy in the form of heat from its surroundings. The piston is working against a pressure of 0.500 atm. The final volume of the system is 58.0...
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#### What steps do I need to use to solve this gas thermochemistry problem?

A sample of an ideal gas at 15.0 atm and 10.0L is allowed to expand against a constant external pressure of 2.00atm at a constant temperature. Calculate the work in units of kJ for the gas expansion

#### Can you help me with this thermochemistry problem?

If the internal energy of a thermodynamic system is increased by 300J while 75J of expansion work is done, how much heat was transferred and in which direction, to or from the system?

10/22/17

#### When aqueous solutions of potassium fluoride and hydrochloric acid are mixed, an aqueous solution of potassium chloride and hydrofluoric acid results

Write the net ionic equation for the reaction.(Use the solubility rules provided in the OWL Preparation Page to determine the solubility of compounds.)Use H+ for the hydronium ion.

#### I am struggling with this problem about a magnesium reaction

Can you help me with this problem about a magnesium metal reaction?Magnesium metal is reacted with excess HI to produce hydrogen gas. The gas is collected over water. 45.82mL of the wet hydrogen...
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#### I am struggling with this problem on gas stochiometry

What volume in millilters of sulfur dioxide can be produced by the complete reaction of 3.82g of calcium sulfite with excess HCl(aq), when the final SO2 pressure is 827 torr at 44°C?

#### Can you help me with this problem on the mond process?

The Mond process produces pure nickel via the thermal decomposition of Ni(CO)4.
The reaction is:
Ni(CO)4==>Ni(s) + 4CO(g)
What volume of CO is formed from the complete decomposition of...
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#### Can you help me with this problem about a magnesium metal reaction?

Magnesium metal is reacted with excess HI to produce hydrogen gas. The gas is collected over water. 45.82mL of the wet hydrogen gas is collected at 30.0°C. The water level in the eudiometer is...
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#### Can you help me with this problem on total pressure?

A sample of He gas (3.0L) at 5.6atm and 25°C was combined with 4.5 L of Ne gas at 3.6 atm and 25°C at constant temperature in a 9.0 L flask. How do I calculate the total pressure in the flask if...
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#### I am struggling with this AP chemistry problem on a chemical reaction between sufuric acid and zinc?

Zinc reacts with aqueous sulfuric acid to form hydrogen gas
Zn(s)+ H2SO4(aq)==> ZnSO4(aq)+H2(g)
In an experiment 201mL of wet H2 is collected over water at 27°C and 26.74 torr. How do I...
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#### Can you help me with problem on average molecular speed?

How do I calculate and arrange the average molcular speeds of Cl2, O2, and F2, and N2 in increasing order?

#### Can you help me with this rate of effusion problem?

How do I calculate which of these pairs of gases have the most nearly identical rates of effusion?
A. CO and CO2
B. CO and N2
C. NO2 and N2O4
D. N2O and NO2
E. N2 and O2

#### Can you help me with this partial pressures problem?

5.0g of SO2 and 5.0g of CO2 are placed in a 750mL container at 50°C. How do I calculate partial pressure of the SO2?

#### Can you help me with this sodium hydride reaction problem?

Sodium hydride reacts with excess water to produce aqueous sodium hydroxide and hydrogen gas
NaH(s)+ H2O (l)=>NaOH(aq)+H2(g)
How do I calculate what mass will produce 982mL of gas at...
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#### How do I calculate the pressure in a 12.2L vessel that contains 2.34g CO2, 1.73g SO2, and 3.33g Ar at 42 degrees Celsius?

Can you please help me with this problem? Thanks

#### I am struggling with this AP Chemistry word problem

A 255mL round-bottom flask is weighed and found to have a mass of 114.85g. A few mL of an easily vaporized liquid are added to the flask and the flask is immersed in a boiling water bath. All of...
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