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Problem- What is the wavelength of energy emitted from by hydrogen atoms when they undergo n=5 to n=4 transitions
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the mass of a sample of boron atoms is 5.60 g. how many boron atoms are in this
Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. If 50.0mL of hydrogen gas is produced at STP, what is the mass of potassium that reacted
What is the final temperature, (in oC), after a 13.5 gram piece of ice at 0oC is placed into a styrofoam cup with 124.0 grams of water initially at 76.5oC? Assume no loss or gain of heat from the surroundings.
a sample of beach sand contains sand particles of different colors small pebbles and also shells. each component
Calculate the molarity of a solution made by adding 23.9 mL of concentrated potassium hydroxide (34.5 % by mass, density 1.46 g/mL) to some water in a volumetric flask
Explain how many milliliters of water vapor, measured at 318 degrees C and 735torr, are formed when 33.6mL of NH3 at 825torr and 127 degrees C react with oxygen according to the following equation. 4 NH3 + 2 O2 ---> 2 N2 + 6 H2O
What is the energy, in joules, of one mole of photons of visible light having a wavelength of 4.89 x 10^2 nm. a) 1.48 × 10^42J
A sample of hydrogen gas is mixed with oxygen gas. The mixture has a total pressure of 820 torr and the oxygen gas has a partial pressure of 32 torr. What is the partial pressure of the hydrogen gas
The volume of a certain gas sample is 235 mL when collected over water at a temperature of and a pressure of 698 mmHg. What will be the volume of this gas sample when measured dry at a standard pressure? The vapor pressure of water at this tempera..
what is the concentration of an naoh solution that requires 50.0 ml of a 1.25 m h2so4 solution to neutralize 78.0 ml of
an auto mechanic spills 91 ml of 2.3 m h2so4 solution from a rebuilt auto battery. how many milliliters of 1.5 m nahco3
The normal boiling point of water (delta H vap = 40.7 kJ/mol) is 100c. At the summit of mount Everest the boiling point of water is 70 c. Calculate the pressure in (torr) at the summit of Mount Ev.
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