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What is the hybridization of the central atom in CH4

What is the temperature in °C, of an 12.5 L sample of carbon monoxide, CO, at 750 torr if it occupies 14.7 L at 65 °C and 750 torr?

The gas tank of a certain luxury automobile holds 4 gallons according to the owner’s manual. If the density of gasoline is 0.8704 g/mL, determine the mass in pounds of the fuel in a full tank. 1 gallon = 3785.41 mL 1 g = 0.00220462 pounds

A photon of light produced by a surgical laser has an energy of 3.027×10-19 J. Calculate the wavelenght in nanometers of the photon.

A sample of 0.75 g of Carbon Dioxide was obtained by heating 2.50 g of Calcium Carbonate. What is the percent yield for this reaction? CaCO3 (s) —> CaO(s) + CO2(g)

What is true about a bonding molecular orbital?

Comparatif et Superlatif. Complétez les phrases pour faire des comparatifs (+, -, =) ou des superlatifs (+ +, – -). Make comparatives if you see a single plus, minus, or equal sign (+, -, =).  Make superlatives if you see a double plus (+ +) or minus (- -) sign. Les bâtiments modernes sont (- -) [answer1] polluants et (+) [answer2] économes en énergie qu’avant. Il a terminé son projet (+) [answer3] rapidement, mais (=) [answer4] efficacement que son collègue. Ce film est (+) [answer5] divertissant que celui d’hier, mais il est (- -) [answer6] impressionnant. Elle a choisi l’hôtel (+ +) [answer7] luxueux mais (- -) [answer8] proche de la plage. Ces explications sont (+) [answer9] claires, mais (=) [answer10] précises que celles du manuel.

How much heat, in Joules,  is produced by burning 150.0 g of methane (CH4) under standard state conditions?

How many grams of gas are present in 7.85 L of C2H4, at 380.0 kPa and 475 K? R= 0.0821 (L.atm/mol.K) 1kPa = 0.00986923 atm Or R= 8.314 (kPa.L/mol.K)      

A balloon is filled with helium to a volume of 15.0 L at a pressure of 125 kPa. If the pressure decreases to 35.0 kPa what is the new volume in Liters, of the balloon (assume T is constant)?