The activation energy for a given reaction is kJ/mol. What is the ratio of the rate constants for this reaction when the temperature is decreased from °C to °C?

What is the mass in grams of the lead : The water level in a graduated cylinder initially at 223 mL rises to 282 mL after a piece of lead is submerged. What is the mass in grams of the lead? |

Calculate the capital gain under the indexation method : Calculate the capital gain under the indexation method and calculate the capital gain under the 50% discount method. |

What is the mass of a glass empty beaker : What is the mass of a glass empty beaker? What is the mass of a glass beaker with 60mL water? |

What will the new temperature be : A certain quantity of helium gas is at a temperature of 27degrees C and a pressure of 1.00 atm. What will the new temperature be if its volume is doubled at the same time that its pressure is decreased to one half of its original value? |

State the activation energy for a given reaction : The activation energy for a given reaction is kJ/mol. What is the ratio of the rate constants for this reaction when the temperature is decreased |

What is the wavelength of an electron traveling : What is the wavelength of an electron traveling with a velocity of 7.0 times 10 to the 3rd power? |

How many milimeters of solution is needed to react : how many milimeters of 0.755 M H2SO4 solution is needed to react with 55.0 mL of 2.50 M KOH solution? Given 2KOH (aq) + H2SO4 (aq) ------ 2H2O (I) + K2SO4 |

Unbiased estimation procedures to end point estimates : The population proportion of economists predicting growth of at least 2.5% in real gross domestic product. The variance of the sample proportion of economists predicting growth of at least 2.5% in real gross domestic product. |

What is the wavelength of an electron traveling : What is the wavelength of an electron traveling with a velocity of 7.0 times 10 to the 3rd power? |

## What is the final concentration of solution72.0 mL of a 1.60 M solution is diluted to a volume of 268 mL. A 134-mL portion of that solution is diluted using 139 mL of water. |

## What volume of na2cro4 solution is neededin a laboratory, 6.82 g of Sr(NO3)2 is dissolved in enough water to form 0.500 L of solution. A0.100-L sample is 0.0245 M solution of Na2CrO4. |

## Find the equivalent expression for a van der waals gasDerive an expression for (dH/dp)T soley in terms of T, p, V. Show that this quantity is identically zero for an ideal gas and find the equivalent expression for a van der Waals gas |

## Work out the formula of the hydrocarbon1 mole of a hydrocarbon of formula CnH2n was burned completely in oxygen producing carbon dioxide and water vapour only. It required 192 g of oxygen. Work out the formula of the hydrocarbon. |

## What is the volume of air at stp that an individual breathesThe normal respiratory rate for a human being is 15.0 breaths per minute. The average volume of air for each breath is 0.505 L at 20.0°C and 9.95 x 104 Pa. What is the volume of air at STP that an individual breathes in one day (in cubic meters or.. |

## State some bacteria are able to harvest infrared light ofSome bacteria are able to harvest infrared light of ? ~ 1000 nm. What is the maximum number of 1000 nm photons needed to form one ATP from ADP and Pi |

## How many liter of hydogen are required to reactHow many liter of hydogen are required to react with 1.9 l of Oxygen to make water at STP according to Avogadro's law. |

## How many milligrams of the radioisotope are still activeIf 115 of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m. ? |

## Cacualte amount of heat required for sublimation of dry iceSolid Carbon dioxide goes directly from a solid to a gaseous state at -78 C cacualte the amount of heat required for sublimation of 30.5g of dry ice |

## What is the vapor pressure of this solutionA solution is prepared by dissolving 246 g of sucrose (C12H22O11) in 624 g of water. What is the vapor pressure of this solution at 30°C? (The vapor pressure of water is 31.8 mmHg at 30°C.) |

## What is the wavelength of the n = 3 standing waveA 6 cm string is fastened at both sides is plucked. What is the wavelength of the n = 3 standing wave? How many nodes does it contain. |

## Explain after the addition of a large excess of acidAfter the addition of a large excess of acid (in comparison with the acid volume needed to reach the equivalence point) D) tell how many millileters of acid are required to reach the equivalence point |

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