Given your knowledge of complex ion formation, what do you expect to happen to the solubility of ZnS(s) in a solution containing excess NH3?

Select one:

a. Solubility of ZnS will be unaffected

b. Less ZnS will dissolve

c. More ZnS will dissolve

## What is the total amount of nh4cl that will precipitateone hundred grams of water is saturated with NH4CLat 50 degrees C. According to table G, if the temperature is lowered to 10 degrees , what is the total amount of NH4CL that will precipitate? |

## Compute the concentration of aqueous ammonia10M NaF solution is slowly added with stirring, to a solution that contains 10M Ca(NO3)2 and 10M Cr(NO3)3 .Which salt CaF2 - or - CrF3 precipitates first? The Ksp for CaF2 = 5.3x10^-9 & Ksp for CrF3 = 6.6x10^-11 |

## What is the specific heat of the substanceThe amount of heat needed to raise the temperature of 25 g of a substance by 15°C is 915 J. What is the specific heat of the substance? |

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## Calculate the activation energy for a reactioncalculate the activation energy for a reaction if its rate constant increases from 10 to 45 s as the temperature increases from 298 to 315 k . |

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## Calculate the fraction of atoms in a sampleCalculate the fraction of atoms in a sample of argon gas at 391 K that have an energy of 12.7 kJ |

## Compute the wavelength of the light in nanometersCalculate the wavelength () of the light in nanometers () corresponding to the energy change () value of this transition. You can use the following values for your calculations |

## Calculate the percentage of cl in a sodium hypochloriteCalculate the percentage of chlorine in a sodium hypochlorite powder (disinfectant for pools) if 5.0 kg of powder gives off 2.3 kg of chlorine. |

## How many moles of sodium sulphate are requiredSodium sulfate dissolves as follows: Na2SO4(s) 2Na+(aq) + SO42- (aq). How many moles of Na2SO4 are required to make 1.0 L of solution in which the Na concentration is 0.10 M. |

## What is the composition of the mixture by volumeA gas mixture composed of helium and argon has a density of 0.605g/L at a 741mmHg and 298K .What is the composition of the mixture by volume? |

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