61. Given the following data 2O_(3)(g)arrow 3O_(2)(g) Delta H=-427kJ O_(2)(g)arrow 2O(g) Delta H=+495kJ NO(g)+O_(3)(g)arrow NO_(2)(g)+O_(2)(g) Delta H=-199kJ calculate Delta H for the reaction NO(g)+O(g)arrow NO_(2)(g)

10. A pure sample of a gas has a density of 1.31g/L at 1.00 atm and 25.0^circ C What is the molar mass of this gas? Propose a possible identity of this gas.

What mass of steam is required to release 497,000 kJ of heat?

Calculate Delta G_(rxn)^circ (in kJ) for a reaction where Delta H^circ =-99kJ,Delta S^circ =+245J/K and T=298K square

Which of the following processes have a Delta S that is negative? Select all that apply Al(s)arrow Al(l) 2N_(2)O_(5)(g)arrow 4NO_(2)(g)+O_(2)(g) H_(2)O(l)arrow H_(2)O(s) CO_(2)(s)arrow CO_(2)(g) N_(2)(g)arrow N_(2)(l)

4. How many grams of water are produced with 4.5 mol of N_(2)O square gH2O

What is a mole? The mass of one atom of an element. The volume occupied by one liter of a gas at standard temperature and pressure. The amount of substance that contains 6.022times 10^23 of the same thing. The number of atoms in one gram of an element.

11. Using the periodic table, which elements are present in the formula CaCO_(3)

The overall reaction 2Co^3+(aq)+2Cl^-(aq)otimes 2Co^2+(aq)+Cl_(2)(g) has the standard cell voltage E_(cell)^circ =0.46V Given E^circ =1.36V for the reaction Cl_(2)(g)+2e^-(2)2Cl^-(aq) calculate the standard reduction potential for the following the half reaction at 25^circ C Co^3++e^-otimes Co^2+ Addyouranswer Integer, decimal, or E notation allowed

What is the molecular formula for the following compound? CH_(2)-CH_(3) CH-CH-CH_(2)-OH CH_(3)CH_(3) C_(5)H_(15)O C_(5)H_(12)O C_(7)H_(15)O C_(7)H_(16)O C_(5)H_(16)O

Hot Questions

How many protons are in an atom of carbon with 7 neutrons? a) 6 b) 7 c) 12.01 d) 13 e) None of the above

How many electrons are in the element potassium with 20 neutrons? a) 19 b) 20 c) 39 d) 39.10 e) None of the above

An erlenmeyer flask has a calibration of 50 mL. To what value can you estimate a measured volume? the nearest 0.01 mL the nearest 1 mL the nearest 0.1 mL the nearest 10 mL

2. Can you determine conclusively that an unknown substance contains only magnetite by using only a magnet? Explain your answer. __

Before you go, which type of molecule would you choose to be the anode in a lithium battery? a) The metal with the most negative potential b) It does not matter since lithium's potential is so negative c) The metal with the most positive potential d) Another lithium compound

$2Fe_{2}O_{3}(s)+3C(s)\rightarrow 4Fe(s)+3CO_{2}(g)$ Calculate the mass of iron produced from the complete reaction of 64.0 grams of iron (III)oxide. 89.5 g Fe 22.48 Fe 11.2 g Fe 44.88 Fe 107 g Fe

QUESTION Q Which of the following is true concerning mass number? ANSWER Using mass number notation, we can identify the number of protons. electrons.and neutrons. Isotopes differ in their numbers of electrons. The mass number is equal to the number of protons. Thus, the mass number of Helium is 2. The mass of electrons contributes significantly to mass number. IDONT KNOWYET

Multiple Choice Question If phenol red is added to a solution with a pH of 9.0, it will appear __ pink-red yellow

What precipitate forms when mixing silver(I)nitrate and sodium chloride? silver(I) chloride sodium nitrate no precipitate forms

Which of these equations correctly expresses the self-ionization of water? $H_{2}O+H_{3}O^{+}\leftrightarrow H_{2}O+OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2H_{3}O^{-}$ $H_{2}O+H_{2}O\leftrightarrow H_{3}O^{+}+OH^{-}$