A sample of helium gas occupies a weather balloon with a volume of 793.4 mL, pressure of 764 Torr and at a temperature of 13 °C. How many moles of helium gas are in the balloon? Express your answer to the correct number of significant figures and include the unit with your answer.

Q: A Honda Accord gets 24 miles per gallon in the city and is estimated to emit 7 tons of CO2 per year.…

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Q: If the RDA for vitamin C is 60. mg per day, and there are 70. mg of vitamin C per 100. g of oranges,…

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Q: How many hours would it take for 1.5 L of saline to be administered with this set up?

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A: Simple use of unitary method to solve this problem

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A:

Q: ach sketch below shows three objects with an electric charge. In each case, decide whether there is…

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Q: (Chemical Connections 1A) The average lethal dose of heroin is 1.52 mg/kg of body weight. Estimate…

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Q: grams per liter

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Q: I have 24 grams of water and 48 grams of ethanol. Which one would be a solute.

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Q: +2 +1 +1

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Q: How many kJ are in 27.4 kcal?

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Q: Propose a method to separate the three substances based on the properties described above.

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Q: Briefly state what separates science from opinion?

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Q: Convert the (US) price of gas of $3.56/gallon into (British) E/L. Hints: 1 £ = $1.35; 1 gallon =…

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.