The diameter of the earth at the equator is 7926.381 mi. Round off the earth's diameter to: A. four significant figures B. two significant figures C. to six significant figures D. Express the earth's diameter in scientific notation.

Q: cal Cal kWh 225 J 5.38 x 10 2 Cal 8.21 x 105 cal 295 kWh 155 Cal

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Q: True or False (2) In thermochemical equations, it only shows the direction of the reaction involved.…

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Q: Given the following thermochemical data: 2HNO3(aq) +Ag2O(s)→ H₂O(1)+2AgNO3(aq) AH = -44.8 kJ…

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Q: 4 The specific heat of wood is 2.03 Jig C. How much heat is released when 550 g of wood is cooled…

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Q: a.) C+ 2H2 = CH4 From the equations: 1. C+ 02= CO2 AH = -393.51 kJ 2. H2 + % O2 = H20 AH = -285.83…

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Q: 4. CO(g) + H2(g)= C8H18(g)+H2O(1)

A: Given-> 4CO(g) + H2(g) <----> C8H18(g) + H2O(l)

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Q: Iron oxide ores, commonly a mixture of FeO and Fe;O,, are given the general formula FeşO, They yield…

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Q: (1) C(s) + O2(g) → CO2(9) AH = -393.51 kJ mol1 (2) S(s) + O2(g) → SO2(g) A:H = -296.83 kJ mol1 (3)…

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Q: Final Temperature (°C) AT (°C) AH (J/mol) AH (kJ/mol)

A: The acid-base neutralization reaction occurs between NaOH and HNO3                  NaOH   + HNO3…

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Q: Constants: • c = 2.9979 x 108 m/s h = 6.626 x 10-34 J s per one photon • R = 8.314 J/(K mol) =…

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Q: Find Z in the following wreaction. H20/Hq+2 Pu lBrz, Z

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Q: Properties of a system could be measurable or non-measurable.

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Q: CIF 3(9) AH = ? 2.) CIF9) + F2(g) AH = - 49.4 kJ 20F2(9) Ozlg) + 2F2(9) AH= 205.6 kJ Cl,0(9) +…

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Q: AH is an Extensive Peperty INp 0:(p NOig Part C AH Changes sign when a process is nevered 2NOg Ng+…

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Q: Now that you know the physical state of each of the reactants and products in this chemical reaction…

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Q: Enthalpy  of 2NH3_N2+3H2

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Q: Salicylic acid and ethanamide were made to react in basic medium to produce aspirin and substance X.…

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Q: Mixing 10.0 g of CaC2 and 25.0 mL of H2O (p = 0.997044 g/mL) conforms to the thermochemical equation…

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Q: 6. How many calories of heat are needed to change 55.00g of nickel at 1250.0°C to 1750.0°C? (C…

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Q: H₂(g) + F₂ (g) 2 H₂(g) + O₂(g) calculate the value of AHxn for 2 HF(g) → 2 H₂O(1) AHrxn 2 F₂ (g) + 2…

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Q: 13. 60 grams of L:OH is Gadded G.9gof waher at 25 The temperature incuesses to 45.5°, What is the…

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Q: Given the following information:   1/2 N2 (g)  +  3/2 H2 (g)  ®  NH3 (g)DH1      NH3 (g)  +  5/2…

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Q: Macmillan Learning Write a balanced equation for the combination of potassium and chlorine to form…

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Q: 4Al(s) + 3O2(g) -> 2Al2O3(s) deltaH is -3352kj is this exo or endo!

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Q: 3. Use the equation of the line from the above graph to determine what the temperature is ( in °C)…

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Q: Given equation 2AgaS67 -> 2H2007 4 Agco) + 2H2SC9 to SH=+595.KJ Calaulate AH Agis)t2 HaSegt Ozig) :-…

A: The reaction given is, => 2 Ag2S (s) + 2 H2O (l) ---------> 4 Ag (s) + 2 H2S (g) + O2 (g)…

Q: Br 1. PPh3 2. nBuLi NHỊNH, ܠ K0H Heat

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Q: Calculate AHxn for the following reaction: 2C2H4 (g) + 2H2 (g) 2C2H6 (g) Using the following data…

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Q: How can I round this number?  Example: Cp = qmetal =  -365.4 cal           = 0.0501 cal/g°C…

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Q: You go climbing in the Andes, and stop to make tea. You find that the water boils at a temperature…

A: Given Values ∆H°vap = 43.4 kj/mol= 43400 kJ/mol Temperature = T1 = 83.9° C =(83.9+272) K= 356.9 K…

Q: The following PEC diagram describes the potential energy and number of configurations of the unmixed…

A: The objective of the question is to identify the correct option.