The half-life of radon-222 is 3.8 days. How much of a 100 g sample is left after 15.2 days?

What are some journal entries : What are some journal entries that must be made at year-end to convert financial statements from accrual to cash basis? |

Understand actual communication with an smtp server : Understand actual communication with an SMTP server can be achieved using TCP Sockets and understand the development of a graphical user interface (GUI) and use of event handling. |

Point of horizontal tangent and derivative at point : Show that there is a point P with x-coordinate 3 at which the line tangent to the curve at P is horizontal. Find the y-coordinate of P. |

Project down into manageable pieces : What breaks a project down into manageable pieces, or items, to help ensure that all of the work elements needed to complete the project work scope are identified? |

How much of a 100 g sample is left : The half-life of radon-222 is 3.8 days. How much of a 100 g sample is left after 15.2 days? |

Point estimate of proportion of population of employees : What is the 95% confidence interval for the proportion of the population of employees who strongly dislike their current work experience? |

Applications of derivative-surface and volume : A company is constructing an open-top, square-based, rectangular metal tank that will have a volume of 66 ft^3. What dimensions yield the minimum surface area? Round to the nearest tenth, if necessary. |

Byronic : Can one separate the characteristically flamboyant "Byronic" lifestyle from Byron's poetry-or are the two inextricable?" |

Question on mean value theorem proof : Let p(x) = Ax^2 + Bx + C. Prove that for any interval [a,b], the value c guaranteed by the Mean Value Theorem is the midpoint of the interval. |

## What is the molarity of silver nitrate in the solutionAn aqueous solution is 22.0% by mass silver nitrate, AgNO3, and has a density of 1.22 g/mL. What is the molarity of silver nitrate in the solution? |

## What is the new water level in the cylinderA graduated cylinder contains 145mL of water. A 10.0g piece of iron (density = 7.86g/cm3 ) and a 22.0g piece of lead are added. |

## Explain molar mass from volumetric dataMolar mass from volumetric data, 2.64g of an organic base, isolated from a shrub in the mountains of Peru was dissolved in 100mL of water. 25.0mL of this solution required 27.5mL of 0.250mL HCL for complete neutralization |

## Calculate density, mole fraction, molarity of solutionA solution of phosphoric acid was made by dissolving 10.0g H2PO4 in 10.0 mL of water. The resulting volume was 104 mL. Calculate density, mole fraction, molarity, and molality of the solution. |

## How many millimoles of non-limiting reactant will be unusedIf iron is oxidized to Fe2+ by a copper(II) sulfate solution, and 0.289 grams of iron and 21.0 mL of 0.433M copper(II) sulfate react to form as much product as possible. |

## Calculate the bond length of carbon monoxideThe J=0 to J=1 transition for carbon monoxide (12C16O) occurs at 1.153 X 10^5 MHz. Calculate the bond length of carbon monoxide. |

## How much energy is involved in the formation of rust?Hf0 for the formation of rust (Fe2O3) is -826 kJ/mol. How much energy is involved in the formation of 5 grams of rust. |

## Derive the rate equation in terms of noderive the rate equation in terms of [NO] and [O2] as well as k ( Assume N2O2 to be in a steady state ) |

## Calculate the change in phCalculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq) |

## What volume of k2s solution is requiredWhat volume of 0.240 M K2S solution is required to completely react with 195 mL of 0.155 M Co(NO3)2. |

## Explain cyclopentadiene reacts as a dieneExplain Cyclopentadiene reacts as a diene in the the Diels-Alder reaction a great deal faster than does 1,3 butadiene. |

## How old is the artifactYou are given a worked wooden item from an archaeological dig believed to date to during the last glaciation. As such, the artifact would be another piece of evidence. |

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