How many moles of MgCO3 are present in 252.939 grams of MgCO3? (5 points) a. 2
b. 3
c. 5
d. 6

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.

At element makes up all organic compounds?

Which of the following is a pure substance? airbloodcopperwood