197 Answered Questions for the topic AP physics

11/09/17

#### Can you help me with this atomic structure problem?

How many orbitals can have the designation 5p, 3dz^2, 4d, n=5, n=4?

11/05/17

#### Can you help me with this atomic structure and periocity problem?

Calculate the longest and shortest wavelengths of light emitted by electrons in the hydrogen atom that begin in the n=6 state and then fall to states with smaller values of n.

11/04/17

#### Can you help me with this AP Chemistry problem?

20. Calculate ∆H for the reaction of sulfur dioxide with oxygen. 2SO2 (g) + O2 (g) → 2SO3 (g) (∆Hf 0 SO2 (g) = –296.8 kJ/mol; ∆Hf 0 SO3 (g) = –395.7 kJ/mol) a. –98.9 kJ c. 197.8 kJ b. –197.8 kJ d....
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11/04/17

#### How do I solve this enthalpy problem involving the formation of rust?

∆Hf 0 for the formation of rust (Fe2O3 ) is –826 kJ/mol. How much energy is involved in the formation of 5 grams of rust? a. 25.9 kJ c. 66 kJ b. 25.9 J d. 66 J

11/04/17

#### How do I solve a heat of reaction problem similar to this one?

18. For which one of the following reactions is the heat of the reaction also a heat of formation of the product?a) N2(g) + 3H2(g) ----> 2NH3(g)b) (1/2)N2(g) + O2(g) ----> NO2(g)c) 6C(s) +...
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11/04/17

#### How do I solve a heat of formation similar to this one?

17. Given the following heats of formation: SO2(g) = -297 kJ/mole, SO3(g) = -396 kJ/moledetermine the heat of reaction (in kJ) for 2SO2(g) + O2(g) ----> 2SO3(g)a) -99 c) 99b) -198 d) 198

11/04/17

#### How do I solve an AP Chemistry problem similar to this one?

11. 3N2O(g) + 2NH3(g) -----> 4N2(g) + 3H2O(g) Enthalpy change = -879.6 kJWhat is the heat of formation for N2O in kJ/mole (heats of formation: NH3 = -45.9 kJ/mole and H2O = -241.8 kJ/mole)?a)...
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11/04/17

#### How do I solve a heat of formation problem like this?

11. 3N2O(g) + 2NH3(g) -----> 4N2(g) + 3H2O(g) Enthalpy change = -879.6 kJWhat is the heat of formation for N2O in kJ/mole (heats of formation: NH3 = -45.9 kJ/mole and H2O = -241.8 kJ/mole)?a)...
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11/04/17

#### How do I solve change in enthalpy problems like this?

3. 2Al(s) + 3O2(g) -----> 2Al2O3(s) enthalpy change is -3351 kJWhat would be the enthalpy change (in kJ) for the formation of 65.0 g of Al2O3(s)?a) -251000b) -126000c) -2464d) -1232

11/03/17

#### How do I solve this problem on a reaction between Ba (OH)2 and H2SO4?

30 mL of 0.10M Ba (OH)2 (aq) is added to 30 mL of 0.10 M H2SO4 and the solution is stirred quickly. The rise is temperate T 1 is measured. The experiment is repeated using 90 mL of each solution...
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11/03/17

#### How do I solve this problem on a reaction between a NH3 and HCl?

When 0.157 lol NH3 is reacted with excess HCl, 6.91 kJ of energy is released as heat. How do I calculate the energy change per mole of NH3?

11/03/17

#### How do I solve this AP Chemistry problem?

1/2O2 (g)+ Hg (l)====> HgO (s) ΔH= -90.8 kJ. How do I calculate how much heat is released when 42.5g of By is reacted with oxygen

11/03/17

#### How do I solve this heat of formation problem?

3Al (s)+3O2 (g)===> 2AlO3 (s) ΔH= -3351kJ
How do I calculate the change in enthalpy in kJ for the formation of 65.0 g of Al2O3?

11/03/17

#### How do I solve this enthalpy of formation problem?

The heats of combustion of C, H2, and CH4 at 298K and 1 atm are respectively -393 kJ/mol, -286 kJ/mol, and -892 kJ/lol. How do I calculate the enthalpy of formation for CH4 using the given...
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11/03/17

#### 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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10/28/17

#### 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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10/27/17

#### 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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10/26/17

#### 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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10/26/17

#### 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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10/25/17

#### 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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10/23/17

#### 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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10/23/17

#### 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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10/23/17

#### 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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10/23/17

#### 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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10/23/17

#### 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

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