A 4 g sample of H2 (9) is combined with a 28 g sample of CO (9), and the following reaction occurs. 2 H2(g) + CO(g) + CH3OH(L)
If 14 g of CH, OH () is produced, the percent yield would be closest to which of the following?

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?