2. A sample of iron weighing 6.50 g (specific heat = 0.449 J/gºC) is colled from 25.3°C to -68.7°C. How much heat was transferred? (Be sure to include the sign).

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

How many moles of oxygen gas are produced from the decomposition of six moles of potassium

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .