Magnesium is reacted with an excess of nitric acid, HNO3. 8.32 grams of hydrogen gas should theoretically be produced. What is the percent yield if only 7.26 grams of hydrogen gas is collected?

75 %
87.3 %
100 %
115 %

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

Which sentence best describes the formation of igneous rock? a- lava on the surface dries up and makes arock b_melted rocks cools and forms crystals c_rocks under tremendous heat and pressure d_magma is melted rock underground

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?