Isotope ?-1 has an atomic mass of 1. 99.985% of all atoms of element ? are of this
form.
Isotope ?-2 has an atomic mass of 2
0.015% of all atoms of element ? are of this form.

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume

1) a light bulb takes in 30 of energy per second. it transfers 3j as use energy. calculate the efficiency. second. it transfers 3j as useful light energy and 27j as heat energy. calculate the efficiency

How far in advance is weather forecasting most accurate