0.0025 g of vitamin a in milligrams

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Can someone me with 3 and 4 plz. this is for masteries test.