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An isotope of a radioactive element has a half-life of 2.5 years. How long will it take for the element to decay from 200 grams to 50 grams? Please show all work.
Balance both of the following chemical equations. Please show all work.
a. Ni + O2® Ni2O3
b. F2 + HBr ® Br2 + HF
A hypothetical metal has a face-centered cubic unit cell and a density of 6.12 g/cm3. The molar mass of the metal is 143.2 g/mol. What is the atomic radius of this metal?
Acid A was titrated by four analysts
In the purification process, the organic layer is washed with 2 M NaOH and then with water. What is the purpose of these washes
A student titrated a sample containing .5671 grams of Oxalic Acid with .3150 N of NaOH. The end point was reached after the addition of 20.12 mL of NaOH. Calculate the experimental equivalent weight for oxalic acid.
Question- A concentration cell consists of two Sn/Sn2+ half-cells. The cell has a potential of 0.14V at 25 ?C. What is the ratio of the Sn2+ concentrations in the two half-cells
Ammonia reacts with oxygen gas to produce water and nitrogen gas. What mass of oxygen gas must be used to react with 19g of ammonia
Teperature(K) Pressure(Torr) 65 130.5 70 289.5 75 570.8 80 1028 85 1718 1. Use the data to determine the heat of vaporization of nitrogen. 2.Determine the normal boiling point of nitrogen
I know it is a dilution problem but I am lost other than that. Please help. The concentrations and final volumes were given in a table and paired by the way.
Bromine can form compounds or ions with any number of fluorine atoms from one to five. Write the formulas of all five of these species
Predict whether reactions should occur between aqueous solutions of the following compounds. If so, write balanced molecular and net ionic equations for the reactions. Include physical states.
calculate the amount of heat transfered when 24.0 g of CH3OH decompose at constant pressure. delta H is 126.4 kJ
what determines the order in which the component elements of binary compounds are written?
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