Acetylene (CH2) is commonly used as a fuel for welding. a) Write a balanced chemical equation that describes the combustion of acetylene. b) Calculate AHrn for the combustion of 1 mole of acetylene. c) A steel MC cylinder can contain 310 grams of acetylene. Calculate the heat released by the combustion of the acetylene in 1 steel MC cylinder.

A sheet of metal weighing 275-g is heated to 100.0 °C and placed flat in 100.00 g bucket of water at 22.0 °C. What is the final temperature of the combined substances? Assume that no heat is lost to the surroundings. The specific heat capacity of the metal is 0.444 J/g.°C . The specific heat of water is 4.184 J/g.°C. Select one: O a. 61.0 °C Оъ. 82.4 °С O c. 79.2 °C d. 40.8 °C × О е. 39.6 °C

When a 45.0 g sample of an alloy at 100.0 °C is dropped into 100.0 g of water at 25.0 °C, the final temperature is 37.0 °C. What is the specific heat of the alloy? The specific heat of H20(1) is 4.184 J'g-1.°c-1. q = mc AT O A. 0.423 J-g-1.°c-1 O B. 9.88 J-g-1.°C-1 O C. 48.8 J'g-1.°C-1 O D. 1.77 Jg-1.°c-1

Calculate the enthalpy change for the reaction of magnesium and water using Hess’s Law.

A 10.0g sample of water at 24C is mixed with 30.0 g of water at 48C.  Calculate the final temperature of the mixture assuming no heat loss to the surroundings.  The specific heat of water is 4.18J/gC.

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Suppose a boil water notice is sent out advising all residents in the area to boil their water before drinking it or using it for cooking. You need to boil 18.0 L of water using your natural gas (primarily methane) stove. What volume of natural gas is needed to boil the water if only 10.1% of the heat generated goes towards heating the water. Assume the density of methane is 0.668 g/L, the density of water is 1.00 g/mL, and that the water has an initial temperature of 21.4 °C. Enthalpy of formation values can be found in this table. Assume that gaseous water is formed in the combustion of methane.

Calculate the final temperature of the water after 2.47 g of zinc at 60.1 0C is added to 29.4 g of water at 16.4 0C. Assume no heat is lost to the surroundings.