06:00Concept of Mole | Avogadro's Number | Atoms and Molecules | Don't MemoriseDon't Memorise566views
17:59Avogadro's Number, The Mole, Grams, Atoms, Molar Mass Calculations - IntroductionThe Organic Chemistry Tutor997views
Multiple ChoiceIf the molar mass of hydrogen is 1.008 g/mol, what is the mass (in grams) of 2 hydrogen atoms?814views12rank
Multiple ChoiceA rigid container has a volume of 0.14m3. It contains a 200°C ideal gas at 1.2atm. How many moles are in the container?295views
Multiple Choice0.0076 moles of an ideal gas is at 24°C. If it is a sealed container with a volume of 86 cm3, what is the pressure of the gas?272views
Textbook QuestionAn element in its solid phase has mass density 1750 kg/m^3 and number density 4.39×10^28 atoms/m^3. What is the element's atomic mass number?272views
Textbook Question(I) If 3.50 m³ of a gas initially at STP is placed under a pressure of 2.80 atm, the temperature of the gas rises to 38.0°C. What is the volume?130views
Textbook Question(II) A storage tank contains 21.6 kg of nitrogen at an absolute pressure of 3.45 atm. What will the pressure be if the nitrogen is replaced by an equal mass of CO₂ at the same temperature?115views
Textbook Question(II) A storage tank at STP contains 26.5 kg of nitrogen (N₂ ). (b) What is the pressure if an additional 32.2 kg of nitrogen is added without changing the temperature?15views
Textbook Question(II) A tank contains 30.0 kg of O₂ gas at a gauge pressure of 8.20 atm. If the oxygen is replaced by helium at the same temperature, how many kilograms of the latter will be needed to produce a gauge pressure of 8.00 atm?136views
Textbook Question"(II) Compare the value for the density of water vapor at exactly 100°C and 1 atm (Table 13–1) with the value predicted from the ideal gas law. Why would you expect a difference?<IMAGE>"141views
Textbook Question(II) What is the pressure in a region of outer space where there is 1 molecules/m³ and the temperature is 3 K?116views
Textbook QuestionEstimate the number of air molecules in a room of length 6.0 m, width 3.0 m, and height 2.5 m. Assume the temperature is 22°C. How many moles does that correspond to?118views
Textbook Question"(II) Estimate the number of(a) moles. Assume water covers 75% of the Earth to an average depth of 3 km."120views
Textbook Question(II) Estimate the number of(b) molecules of water in all the Earth’s oceans.Assume water covers 75% of the Earth to an average depth of 3 km.102views
Textbook QuestionHow does the number of atoms in a 31.5-g gold ring compare to the number in a silver ring of the same mass?117views
Textbook QuestionFrom the known value of atmospheric pressure at the surface of the Earth, estimate the total number of air molecules in the Earth’s atmosphere.77views
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