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1. How many grams of water are needed to react with 78.0g CaCN2?
2. How many grams of NH3 are produced from 5.19g CaCN2?
3. How many grams of CaCO3form if 157 g water react?
After the addition of a large excess of acid (in comparison with the acid volume needed to reach the equivalence point) D) tell how many millileters of acid are required to reach the equivalence point
Some ice cubes at 0 degrees C with a total mass of 379g are placed in a microwave oven and subjected to 750. W (750. J/s)of energy for 5.00 minutes. (Assume all energy of the microwave is absorbed by the water and no heat loss by the water.)
the thermite reaction is performed using 8.6g Fe2O3 and 1.8g powdered Al metal. which reactant is in excess and by how much?
An aqueous solution containing 21.6 mg of vasopressin in 100.0 mL of solution has an osmotic pressure at 25.0 oC of 3.70 mmHg. What is the molecular weight of the hormone?
The [H3O+] is 1*10-6M in a solution. Calculate the [OH-]
Calculate the amount of energy in kilojoules needed to change 117 of water ice at 10 to steam at 125 . The following constants may be useful.
A 5.0 dm3 sample of oxygen at a pressure of 200kPa and 2.0dm3 sample of nitrogen at a pressure of 500kPa are introduced into a 2.5dm3 vessel.
Meaning, use and calculation of empirical formulas, In this introduction are given the explanation of how to find out an empirical formula if one has found out the chemical elements of an unknown substance and measured their ratio of masses
When 25.0 mL of 0.750 M CdCl2 is mixed with 40.0 mL of 0.120 M (NH4)2S, CdS precipitates from the solution. How many moles of CdS is formed.
Determine how much PV work is done if 80.0 g of C 2 H 4 and 125 grams of hydro chloric acid are permissible to react at atmospheric pressure and the volume change = -63.9 L? express your answer in kilojoules
A 4.70 g nugget of pure gold absorbed 278 J of heat. The initial temperature was 28.0°C. What was the final temperature.
What steps do you think need to be taken to prepare the blood sample so that it will be amenable to this type of analysis?
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