Calculate the amount of heat needed to boil 129. g of methanol (CH 3 OH), beginning from a temperature of 38.4 °C. Be sure your answer has a unit symbol and the correct number of significant digits. 0 1x10 ☑

Calculate the amount of heat needed to melt 180.g of ice (H2O) and bring it to a temperature of 41.4°C. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol.

Calculate the amount of heat needed to melt 13.2 g of ice (H₂O) and bring it to a temperature of 88.5 °C. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol. 0

[Using heat of fusion or vaporization to find the heat needed to melt or boil a substance] Calculate the amount of heat needed to melt 14.1g of solid octane (C8H18) and bring it to a temperature of −25.7°C. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol.

When 3.00 kg of water vapor cools to a temperature of 373 K, the value of q = –1950 kJ. If the specific heat of water vapor is 1.86 J/g.oC, what is the initial temperature of the water vapor in degrees Celsius? (0 oC = 273 K). Give your answer to 2 significant figures, but not in scientific notation.

Indicate whether the rounding is correct: 1875 ± 100 → (1.8 ± 0.1)·103

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An organic chemist measures the temperature I of a solution in a reaction flask. Here is the result. T = 29.6 °C Convert I to SI units. Be sure your answer has the correct number of significant digits. Ок x10 X Ś

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Acetylene (C₂H2₂) gas is often used in welding torches because of the very high heat produced when it reacts with oxygen (O₂) gas, producing carbon dioxide gas and water vapor. Calculate the moles of oxygen needed to produce 1.4 mol of carbon dioxide. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits. 0 00 X x10 0.0 ? O BE ole