A certain first-order reaction has a rate constant of 2.30×10-2 s^-1 at 23 C. What is the value of k at 55 C if Ea= 84.0 kj/mol?

Explain auto ionization of water exothermic or endothermic : The Kw value decreases and temperature decreases. Is the auto ionization of water exothermic or endothermic |

Management issues of computer security : What are the major defensive mechanisms that can be used to stop such attacks-Pick up one mechanism and comment on it - Management issues of computer security |

Obtain the volume of bubble just before it breaks surface : At 28.0 m below the surface of the sea (density = 1 025 kg/m3), where the temperature is 5.00°C, obtain the volume of the bubble just before it breaks the surface |

Compute the quantity of energy produced per gram of reactant : Calculate the quantity of energy produced per gram of reactant for the fusion of -3 (atomic mass = 3.016049 ) with -1 (atomic mass =1.007825 ) to form -4 (atomic mass = 4.002603 |

Explain what is the value of k at 55 c if ea= 84.0 kj/mol : A certain first-order reaction has a rate constant of 2.30×10-2 s^-1 at 23 C. What is the value of k at 55 C if Ea= 84.0 kj/mol |

Explain what are the theoretical ratios of the reactants : What are the theoretical (stoichiometric) ratios of the reactants used in the condensation polymerization of phthalic anhydride and glycerol |

State how to synthesize 2-methyl-2-pentene from alkyl halide : Show how to synthesize 2-methyl-2-pentene from an alkyl halide and an aldehyde or ketone, plus any other necessary reagents. |

Determine what new volume does the gas occupy : A cylinder with a piston holds 0.80 m3 of oxygen at an absolute pressure of 8.0 atm. what new volume does the gas occupy |

Determine what is the weight of the truck : A small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, the boat sinks an additional 4.20 cm into the river. What is the weight of the truck |

## State what is the probability of finding a particle of massWhat is the probability of finding a particle of mass m in (a) the left-hand and one-third, (b) the central one-third, and (c) the right-hand one-third |

## Evaluate the molarity and the molality of an nh solutionCalculate the molarity and the molality of an NH solution made up of 28.0 g of NH in 70.0 g of water. The density of the solution is 0.982 g. |

## Explain what volume of 2.00 m hci solution must be dilutedWhat volume of 2.00 M HCI solution must be diluted to produce 0.500 L of 0.250 M HCI solution |

## Find out the molecular weight of the liquidA 2.56 g sample of a colorless liquid was vaporized in a 250mL flask at 121*C and 786 mmHg. Determine the molecular weight of the liquid |

## Explain how many grams of dry nh4cl needed for solutionHow many grams of dry NH4Cl need to be added to 2.50 L of a 0.100M solution of ammonia, NH3, to prepare a buffer solution that ahs a pH of 8.80? |

## State boiling points of the pure components of mixtureIn either of the simple distillation experiments, can you account for the boiling point of your product in terms of the known boiling points of the pure components of your mixture? |

## Explain how do calculate the solubilityHow do you calculaate the solubility (in grams per liter) of magnesium hydroxide Mg(OH)2 |

## Give the solution to equilibrium constantThe solution to Equilibrium constant, A certain gas mixture held at 395C has the following initial partial pressures: P(Cl2) = 351.4 torr; P(CO) = 342.0 torr and P(COCl2) = 0. |

## Explain how many grams of solid sodium phosphateHow many grams of solid sodium phosphate, Na3PO4, are needed to prepare exactly 250ml of a 0.500M Na+ solution? |

## Compute the overall relative standard deviationCalculate the overall relative standard deviation, the relative standard deviation of the method, and the relative standard deviation of the sampling process. |

## Evaluate what is the molar mass of the gasAn experiment shows that a 248 -mL gas sample has a mass of 0.433 g at a pressure of 749 mmHg and a temperature of 29*C. What is the molar mass of the gas |

## The enthalpy of formation of compound x is -612 kjmol andthe enthalpy of formation of compound x is -612 kjmol and the sole product of its combustion has a enthalpy of |

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