The half life of polonium-210 is 138.4 days. How many milligrams of polonium-210 remain after 415.2 days if you start with 2.0 mg of the isotope?

How much must be allocated now : A sum of sufficient magnitude is to be invested now so that starting in 10 years from now an amount of $2500 per year can be paid in each of 8 succeeding years. The unexpended money remains invested at 6% compounded annually. How much must be allo.. |

Compute the molarity of the hcl solution : Calculate the number of mmoles of primary standard grade Na2CO3. b. How many mmoles of HCl reacted with the Na2CO3? c. Calculate the molarity of the HCl solution. |

What will be the future worth of a series of annual payment : What will be the future worth of a series of 15 annual $1500 payments if the nominal annual interest rate is 7% and the interest is compounded quarterly? |

Write a sequence of biochemical reactions : Write a sequence of biochemical reactions, starting with pyruvate, that results in a balanced equation that has the net formation of an a-ketoglutarate, without the formation of any other TCA cycle intermediates (but can have ATP, NAD+, H2O, CO2, .. |

How many milligrams of polonium-210 remain : The half life of polonium-210 is 138.4 days. How many milligrams of polonium-210 remain after 415.2 days if you start with 2.0 mg of the isotope? |

What has been effect of longtime control in new york city : What has been the effect of longtime rent control in New York City? Why were controls initially imposed and why do they persist to this day? |

Create interval for the true average age of the consumers : The average age in the sample was 22.5 years with a standard deviation of 5 years. Construct a 95% confidence interval for the true average age of the consumers. |

Income statement for subscriptions revenue : In November and December 2007, Lane Co., a newly organized magazine publisher, received $90,000 for 1,000 three-year subscriptions at $30 per year, starting with the January 2008 issue. Lane included the entire $90,000 in its 2007 income tax retur.. |

Are neurons more likely have depolarized or hyperpolarized : During sleep, relay neurons in the thalamus reduce information reaching the cerebrum by altering their membrane potential. Are these neurons more likely to have depolarized or hyperpolarized? Explain you reasoning. |

## How much heat will be given offFollowing the equation for the combustion of 2C3H6O+8O2----->6CO2+6H2O+853.6 kcal. How much heat will be given off if 0.48 mol of acetone is burned completely? |

## Explain working with ideal gas lawWorking with ideal gas law, The pressure of a sample of gas at a constant temperature of 25 degrees C is increased from 1.0atm to 1.3atm |

## What number of bags are needed to cover a plotThe contents of one 80. lb bag of topsoil will cover 30. square feet of ground to a depth of 1.7 in. What number of bags are needed to cover a plot that measures 600. by 700. m to a depth of 1.5 cm. |

## Determine the ph and the percent ionizationPH And Percent Ionization, 1. Determine the pH and the percent ionization in a 0.50M solution of KOBr. The Ka for HOBr = 2.5 x 10 ^ -9. |

## Define protonation of the ethanolthe alcohol attacking the 2-phenylacetic acid with the subsequent loss of a proton. b. protonation of the ethanol by H2SO4. c. protonation of the carbonyl oxygen of the 2-phenylacetic acid. d. protonation of the hydroxyl group of the 2-phenylac.. |

## What is the molar mass of a gasWhat is the molar mass of a gas if 0.358 g of the gas occupies a volume of 186 mL at 5.00C and 1.10 atm. |

## Place the solutions in order of increasing freezing pointsYou are given trhat 0.01 m aqueous solutions of each of the given solution as, C6H12O6, K3PO4, CaCl2 , NaI you jutst need to place the given solutions in order of increasing change in the freezing point of the solution. |

## What would the new volume of the gas beA sample of hydrogen occupies a volume of 1.20 liters at a pressure of 425 kilapascals. If the temperature of the gas is constant, what would the new volume of the gas be at 615 kilapascals? |

## How much heat is requiredHow much heat is required to warm 12.0 g of ice, initially at -11.0 C, to steam at 113.0 C? |

## How many gallons of paint are needed for the roomIf the walls in a room are 955 square feet in area, and a gallon of paint covers 15 square yards, how many gallons of paint are needed for the room? |

## How much heat is evolvedHow much heat is evolved in converting 1.00 mol of steam at 145°C to ice at -50.0°C? The heat capacity of steam is 2.01J/g?°C and of ice is 2.09J/g?°C. |

## What is the final volumeIf the presure of 50.0 mL of oxygen gas at 100oC increases from 735 mm Hg to 925 mm Hg, what is the final volume? Assume the temperature remains constant. |

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