The freezing point depression of water is a rather small 1.86 deg C kg/mol. Addition of 0.100 g of an unknown compound to 2.50 g of water results in a decrease in the melting point of 2.3 deg C. What is the molecular mass of the unknown?

Evaluate the minimum mass of hydrochloric acid : Calculate the minimum mass of hydrochloric acid that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits. |

What quantity of ice melts : A 2.94g aluminum bullet at 31.0°C is fired at a speed of 236 m/s into a large block of ice at 0°C, in which it embeds itself. What quantity of ice melts |

What is the factor of safety in the brick column : What is the stress and strain in a 2 meter high, .025 m diameter brick column that supports a mass of 100000 kg? What is the factor of safety in the brick column |

Calculate the specific gravity of a liquid : Calculate the specific gravity of a liquid given the following information: m = 51.50 ± 0.05 grams, mA = 32.00 ± 0.05 grams,mL = 42.50 ± 0.05 grams |

Explain the molecular mass of the unknown : The freezing point depression of water is a rather small 1.86 deg C kg/mol. Addition of 0.100 g of an unknown compound to 2.50 g of water results in a decrease in the melting point of 2.3 deg C. What is the molecular mass of the unknown |

Find the original speed of the son : A father racing his son has three-fifths the kinetic energy of the son, who has half the mass of the father. What is the original speed of the son |

How many kilograms of water are put on the fire : A fire truck attaches two fire hoses to a hydrant to fight a fire. each hose has a diameter of 20 cm. How many kilograms of water are put on the fire in 30 minutes |

Explain enthalpy and entropy are not temperature dependent : Above what temperature, in °C, will the following reaction become spontaneous? Assume free energy, enthalpy, and entropy are not temperature dependent. |

By what factor does the stored energy change : A capacitor consists of two concentric conducting spherical shells with radii R1 and R2 = 4.0R1. It has capacitance C = 4.0 pF, and is charged to a potential difference of 60.0 V. by what factor does the stored energy change |

## State calibrate ion-selective electrodesYou will need two series of standard solutions to calibrate your ion-selective electrodes - one series for sodium and one for calcium. |

## What is the ph of a bufferWhat is the pH of a buffer that consists of 0.45 M CH3COOH and 0.35 M CH3COONa? Ka = 1.8 × 10-5 |

## What must be the mass of the sampleparticular sample of pure iron requires 0.595 kJ of energy to raise its temperature from 25oC to 45oC. The specific heat of iron is 0.45 J/g oC. What must be the mass of the sample? |

## Define the initial concentration of n2o5the first order decomposition of N2O5 at 238 K has a rate constant of 1.70 * 10-3. If the initial concentration of N2O5 is 2.88M, |

## Explain solid calcium oxide mixes with carbon dioxide gasSolid calcium oxide mixes with carbon dioxide gas. Diphosphorus pentoxide is added to water. Hydrogen sulfide gas is bubbled through a solution of silver nitrate. |

## What is the molarity of a solutionWhat is the molarity of a solution prepared by adding 29.3 g of HNO3 to enough water to make 2 L of solution |

## Calculate kConsider the equation A(aq) + 2B(aq) -> 3C(aq) + 2D(aq). In one experiment, 45.0 mL of 0.050 M A is mixed with 25.0 mL 0.100 M B. At equilibrium the concentration of C is 0.0410 M. Calculate K. |

## How many grams of dry nh4cl need to be addedHow many grams of dry NH4Cl need to be added to 2.10L of a 0.500 M solution of ammonia, , to prepare a buffer solution that has a of 8.84? Kb for ammonia is 1.8*10^-5. |

## Explain the mixture has the same specific heatAssuming the mixture has the same specific heat (4.184J/goC) and density (1.00 g/cm3) as water, calculate the heat (in J) transferred to the surroundings, qsurr. |

## Explain the unknown solution contained the metal ionAddition of the permanganate solution to the unknown solution would colorimetrically indicate whether metal(III) is reduced to metal(II). If the unknown solution contained the metal(III) ion, the purple color of the solution would get darker. If t.. |

## The balloon is blown up with air from a starting volumeThe balloon is blown up with air from a starting volume of 1 m3 to a volume of 3 m3. Find the final mass of air assuming it is at 25oC and the work done by the air |

## State what is the molecular formula of the gasAn unknown gas contains 82.6% C and 17.4% H by mass. It effuses at 0.87 times the rate of CO2 gas under the same conditions. What is the molecular formula of the gas |

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