Urea, NH2CONH2, is a nitrogen fertilizer that is manufactured from ammonia and carbon dioxide. 2 NH3(g) CO2(g) ? NH2CONH2(aq) H2O(l) What volume of ammonia at 45°C and 1.60 atm is needed to produce 908 g (2 lb) of urea?

Explain source of small quantities of carbon monoxide : Formic acid, HCHO2, is a convenient source of small quantities of carbon monoxide. When warmed with sulfuric acid, formic acid decomposes to give CO gas |

What are the mean and the variance if x equals the outcome : Suppose a random variable X has a discrete uniform distribution on the first m positive integers. Find the mean and the variance of X. What are the mean and the variance if X equals the outcome when rolling a fair six-sided die |

What are some of the possible negative outcomes for employer : What are some of the possible negative outcomes for employers and/or employees regarding alternative work arrangements? Please explain your answer. |

What is the probability that mr lonely has at least one date : Mr. All-the-Time-Lonely has been using an internet dating service from eharmoeny.com to meet a woman. According to his past observation over a long period of time, he has been successful in dating a woman at one of ten trials on average. |

State nitrogen fertilizer that is manufactured from ammonia : a nitrogen fertilizer that is manufactured from ammonia and carbon dioxide. 2 NH3(g) CO2(g) ? NH2CONH2(aq) H2O(l) What volume of ammonia at 45°C and 1.60 atm is needed to produce 908 g (2 lb) of urea? |

Evaluate the molecular weight of the solute : A 4.305-gram sample of a nonelectrolyte is dissolved in 105 grams of water. The solution freezes at -1.23°C. Calculate the molecular weight of the solute. Kf for water = 1.86°C/m. |

Find the probability that exactly four people approve : According to the recent CNBC and the Wall Street Journal poll, 40% of the American public approves of the way the President of the United States is handling his job. Take a random sample of n = 10 Americans. And let X equal the number who gives ap.. |

What is the point estimate for the population mean : Company is packaged and sold with unknown weight and standard deviation. Seven packages are randomly selected and weighed with the following results in pounds. |

What is the point estimate for the population mean : The mean lifetime of all light bulbs produced by a manufacturer is unknown. A sample of 144 bulbs is randomly selected and tested. The average lifetime of this group is measured and found to be 1500 hours with a sample standard deviation of 1.. |

## The volume of a sample of nitrogen gas initially at stpThe volume of a sample of nitrogen gas initially at STP is decreased and at the same time the temperature is increased. What happens to the pressure of the sample? |

## How many liters of o2 are neededHow many liters of O2 are needed to react completely with 45.0L of H2S at STP? 2H2S(g) + 3O2(g) -> 2SO2(g) +2H20(g) |

## What pressure is exerted by gas dA mixture of four gases exerts a total pressure of 860 mm Hg. Gases A and B each exert 220 mm Hg. Gas C exerts 110 mm Hg. What pressure is exerted by gas D? |

## What is the order of the reactionWhat is the order of the reaction if it takes 10 minutes, 20 minutes, 30 minutes to reach 75% conversion? |

## What recovery of product based on the mass of crude product"What was the % recovery (by mass) of product based on the mass of crude product?" The starting unkown material weighed .2415g, the melting point of just the sample was 51.4-95.2 degrees C, |

## Explain how many moles of vitamin c were originally presentIf 40.00mL of 0.4445M I2 was added to a sample containing vitamin C, the unused I2, required 23.95mL of .197M S2O3^2- to react. How many moles of vitamin C were originally present? |

## Explain the equations and indicate the type of reactionBalance the equations and indicate the type of reaction. HgO -> Hg + O2. and also AgNO3 + BeCl3 -> AgCl + BeNO3. |

## What weight of pb(no2)2 wil have to be dissolvedWhat weight of Pb(NO2)2 wil have to be dissolved in one liter of water to prepare a 100ppm Pb2+ solution. |

## Identify the compound from its spectraA bottle is labeled only "Compound B (C6H12)" and contains a colorless liquid. You have been called in as an expert to identify this compound from its spectra |

## What is the new volumeThe temperature of a 2.25 L sample of gas decreases from 35C to 20C. What is the new volume? |

## Define lone pairs of electronsuse curved arrows to show the flow of electrons in each step, and note any relevant charges or lone pairs of electrons. |

## Complete the following equations in molecular formComplete the following equations in molecular form. The reactant coefficients are correct. Indicate precipitation, redox, or acid – base. Write the equations in NET ionic form (no spectator s). Balance charges and use the correct suffixes. |

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