Ethanol (C2H5OH) melts at -114 °C. The enthalpy of fusion is 5.02 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K, respectively. How much heat (kJ) is needed to convert 25.0 g of ethanol at -155 °C to vapor phase at 78 °C?

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Which is the higher density of polyethylene : Polyethylene Density, (a) Which is the higher density of polyethylene, linear or branched? Select the choice with the best accompanying explanation. |

Certificate maturity value : Freddy purchased a certificate of deposit for $20,000 on January 1, 2010. The certificate's maturity value in two years (December 31, 2011) is $22,050, yielding 5% before-tax interest. |

How much heat (kj) is needed : Ethanol (C2H5OH) melts at -114 °C. The enthalpy of fusion is 5.02 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K, respectively. |

Create the 5-step hypothesis test for particular claim : Develop the 5-Step Hypothesis Test for a particular claim related to your work or life environment. (This should be a test of one-sample mean or one-sample proportion. |

Computing rate and activation energy of diffusion : Calculating Rate and Activation Energy of Diffusion, a) How do I calculate the time that will it take for 0.001 moles of CO2 to leak from a container at steady-state, assuming that the amount of CO in the surroundings is insignificant? |

What is the br- concentration : When 9 mL of a solution containing 2.5 M AlBr3 is diluted to 30 mL, a dilute solution is formed. What is the Br- concentration in 15 mL of the dilute solution? |

Find the total revenue at break even point : With a selling price of 40 dollars each, how many pool cues must be sold to break even? What would the total revenue be at this break even point? |

## What is the pressure on the gas trapped in the buretif the height of the mercury column in a leveling bulb is 30 mm greater than that in the gas buret and atmospheric pressure is 670 mm, what is the pressure on the gas trapped in the buret. |

## Proposals for dealing with hazardous wasteReduce the production of hazardous waste and encourage recycling and reuse of hazardous materials by charging producers a tax or fee for each unit of waste generated. |

## How many milliliters of coffee can be obtainedA pound of coffee beans yields 30 cups of coffee (4 cups = 1 q). How many milliliters of coffee can be obtained from 1 g of coffee beans. |

## Guesstimate the extent of the dipole momentGuesstimate the extent of the dipole moment of H 2 O in Debye units, treating H 2 O as three point charges. suppose the O-H distance = 1.00 A, angle H-O-H =104°. The |

## What is the concentration of nitrogen gas at equilibriumFor the reaction: N2(g) + 2 O2(g) ? 2 NO2(g), Kc = 8.3 × 10-10 at 25°C. What is the concentration of N2 gas at equilibrium when the concentration of NO2 is twice the concentration of O2 gas. |

## Calculate the volume of sodium hydroxide solutionCalculate the volume of 0.540 M sodium hydroxide solution contains 11.5 grams of sodium hydroxide? |

## Compute the final temperature of the solutionCompute the final temperature of the solution assuming no heat lost to the surroundings .the solution has a specific heat capacity =4.18 J/°C·? |

## Calculate the value of kspAt 25 oC the solubility of copper(II) iodate is 3.27 x 10-3 mol/L. Calculate the value of Ksp |

## What is the empirical formula for butyric acidA 0.440 g sample of butyric acid (an organic acid consisting of C, H, and O atoms) is combusted in excess oxygen, yielding 0.882 g CO2 and 0.360 g H2O. |

## What volume would this gas occupya sample of gas at 77 degreees celsius and 1.03 atm occupies a volume of 2.02L. What volume would this gas occupy at 107 degreees celcius and 0.789 atm. |

## Discuss how precise and accurate measurement achievedEvery measurement has a measurement uncertainty. Discuss how precise and accurate measurement can be achieved in spite of the inherent measurement uncertainty. |

## Evaluate the molecular formula of a compoundTo determine the molecular formula of a compound - gas was mixed with calcium chloride solution, |

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