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An element has a mass of 207 and has 125 neutron in its nucleus. how many protons and electrons does it have and where are they located
The lid is tightly sealed on an empty 2.0L soda bottle at 25.0 degrees Celsius and 732 mm Hg. If the bottle is heated to 100.0 degrees Celsius, what is the pressure in the bottle?
what is the maximum mass of aspartame you can add to 2.00kg of pure water and still have the solution freeze.
what kind of inter-molecular interactions would likely dominate? explain your reasoning
The allowable concentration level of vinyl chloride,C2H3Cl , in the atmosphere in a chemical plant is 2.4×10-6 .How many moles of vinyl chloride in each liter does this represent? How many molecules per liter?
How much heat is evolved when 9.07 x 105 g of ammonia is produced according to the following equation:
what is the formula for the ionic compounds formed by magnesium ions and calcium ions with nitrate ions?
Metals such as magnesium and zinc react with dilute sulfuric acid to give hydrogen, according to the equation: M (s) + H2SO4 (aq) -------> MSO4 (aq)
A solution is made by mixing 15.0 g of NaOH and 71.0 mL of .19 M HNO3. Calculate the concentration of Na+ ion remaining in solution.
Would a buffer containing HF and F- in appreciable quantity be expected to have a pH of around 3,5,7 or 9? Justify your answer.
Cyanogen is a gas which contains 46.2 % C and 53.8 % N by mass. At a temperature of 25oC and a pressure of 750 mmHg, 1.50 g of cyanogen occupies 0.714 L.
Determine the V of a voltaic cell (E°cell) if it is required to do 5.43 × 10¯3 Kilo Joule of work when a charge of 2.50 C is transmitted.
When a system is in a state of chemical equilibrium, a state of apparent rest, is anything going on at the molecular
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