C-12 and c-13 are naturally-occurring isotopes of the element carbon. c-12 occurs 98.88% of the time and c-13 occurs 1.108% of the time. what calculation should be used to determine the atomic mass of this element?

How to solve 4 nh3(g) + 5 o2(g) > 4 no(g) + 6 h2o(g) in chemistry

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size