Questions asked by Kevin U.

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• A sample of compound containing C, O, and silver (Ag) weighed 1.372 g. On analysis it was found to contain 0.288 g O and 0.974 g Ag. The molar mass of the compound is 303.8 g/ mol. What is the empirical and molecular formula of the compound?
  
• Calculate the molarity of the solute in a solution containing 14.2 KCl in 250 mL solution?
  
• Given the Following: heat of fusion of ice = 80.0 cal/g; specific heat of ice = 0.480 cal/g; and specific heat of water = 1.00 cal/g. Calculate the amount of heat required to melt 30.0 g of ice at 0 degrees celsius?
  
• What volume of ammonia gas, NH3, in liters is produced at stp by the complete reaction of 100 g of nitrogen N2, with excess hydrogen? N2 + 3H2 ---> 2NH3
  
• Near Room temperature air has a density of 1.18 x 10^-3 g/ml. What volume will 30.77 grams of air occupy?
  
• I need help with this question it relates to blood volume in a medical setting?
  
• Sodium-24 has a half-life of 15.0 hours. Suppose you had a sample containing 0.010 moles of Na-24. How many hours would be required to reduce your sample to 6.25 x 10^-4 moles?
  
• The following reaction is observed in a lab experiment: #A + 2B -> C + D# In this experiment, it required 750 s for the concentration of #C# to change from 0.333 M to 0.750 M. What is the rate of the reaction?
  
• What are Koch's Postulates?
  
• How can I do the limit for this problem?
  
• How many times would the dust particles encircle the planet? based on the mole concept
  
• What is the theoretical percent water in the hydrate MgSO47H2O?
  
• This question is using the concept Law of multiple proportions, how cn I use that law to solve this problem?
  
• Two iron bolts of equal mass one at 100° C, the other at 55°C are placed in an insulated container, assuming heat transfer is negilble, what is the final temperature of the container? (c of iron =0.450 j/g* °C)
  
• What is a state function? What are examples of a state function and when its not a state function?
  
• Need help with Hess law problem cant come up with third equation?
  
• Given the following data, what is the heat of formation of methane (CH4) gas?
  
• What is the domain of the function?
  
• What is the partial derivatives of this function?
  
• Need help with Lagrange multiplier question?
  
• What are the relative extreme values of the function?