What mass of this substance must evaporate in order to freeze 160 g of water initially at 19 C? (The heat of fusion of water is 334 {J/g}; the specific heat of water is 4.18 {J/g c. K}.)

What is the percent yield : If 25.6 L of NO2 forms, measured at 35°C and 605 mm Hg, what is the percent yield? |

Explain what is the concentration of the hcl : Explain What is the concentration of the HCl, A 25.00 mL sample of HCl of unknown concentration is completely neutralized with 25.00 mL |

Analyze the economy and make guesses about the future : Let's say that companies that produce and sell silk shirts hire analysts to analyze the economy and make guesses about the future |

Find the probability that exactly three items are defective : Ten percent of the items produced by a machine are defective. Out of 15 items chosen at random. What is the probability that exactly 3 items will be defective? |

What mass of the substance must evaporate : What mass of this substance must evaporate in order to freeze 160 g of water initially at 19 C? (The heat of fusion of water is 334 {J/g}; the specific heat of water is 4.18 {J/g c. K}.) |

Compute the standard deviation of the return as a percentage : Compute the standard deviation of the return as a percentage over the coming year c) If the risk-free return is 7%, what is the risk free premium for a stock market investment? |

What percent of variation are restaurant sales explained : Which of the coefficients are statistically significant and which are not? Explain. d. What percent of variation are restaurant sales explained by this equation? |

General journal entry for the cash purchase : Prepare CPA's general journal entry for the cash purchase of CMA's net assets. Do not use implied fair value. |

Probability three messages are received in one-half hour : Poisson random variable with a mean rate of 8 messages per hour. What is the probability that fewer than three messages are received in one-half hour? |

## Interfacial tension of the solid liquid interface changeA nonelectrolyte solution adsorbs on an electrically neutral solid through a liquid. Two surfaces of this type are brought close to one another in the liquid such that they interact. |

## Engine''s dimensions based on its powerDetermining a Four Stroke Engine's Dimensions Based on its Power, The engine produces indicated power of 35 HP. While it is running at 2500 RPM. Find the dimension of the engine. |

## How much oxygen is requiredIf 3.1 mol of ethane (C2H6) undergo combustion according to the unbalanced equation C2H6 + O2 ->CO2 + H2O, how much oxygen is required? |

## How many moles of co(nh2)2 are presentHow many moles of CO(NH2)2 are present in 150 g of water, if the freezing point of the solution is -4.02C? kf(water) = 1.86 K · kg/mol. |

## Giving examples give the mechanisms of aldol condensationGiving examples give the mechanisms of Aldol condensation between two molecules of aldehydes and two molecules of ketones |

## What amount of potassium chloride formsWhat amount of Potassium Chloride forms when 5.25 litres of Chloride gas at 0.95 atm and 293 K reacts with17.0 g of Potassium |

## What volume will the dry air occupyA 125 mL sample of dry air at 230 degrees celcius is cooled to 100 degrees celsius at constant pressure. What volume will the dry air occupy at 100 degrees celsius. |

## What is the maximum wavelength of lightHFC's (hydrofluorocarbons) are replacing CFC's (chlorofluorocarbons) because the C-H and C-F bonds are stronger than C-Cl bonds. If the bond enthalpy of a C-F bond is 482 kJ/mol. |

## Write equations to show how nitronium ions might be formedOrganic chemistry mechanism and conceptual problems involving, Write equations to show how nitronium ions might be formed using a mixture of nitric and sulfuric acids. |

## What is the final concentration of na+What is the final concentration of Na+ if 250 ml of 0.3 M Na Cl is added to 750 ml of 0.125 M Na2SO4? |

## Calculate the ph of a solutionSorbic acid, C5H7COOH, is a weak monoprotic acid with Ka = 1.7 x 10-5. Calculate the pH of a solution containing 11.25 g of potassium sorbate in 1.75 L of solution. |

## How many grams of carbon dioxide will be producedwhen carbon is burned in the presence of oxygen, the carbon and oxygen combine to produce carbon dioxide. if you start with 3 grams of carbon and 8 grams of oxygen and they react completely, how many grams of carbon dioxide will be produced? |

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