What is the mass of a substance that has a specific heat of 0.449 J/g°C and raises its temperature in a calorimeter from 20°C to 90°C when it releases 12,300 J of energy?

At stp, what is the volume of 1 mole of co2?

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?