Moles â¢ The mass of 1.0 mole of an element is equal to the atomic mass in grams. â¢ One mole element = 6.022 x 10 23 atoms. This number is called Avogadroâs number. â¢ Example: 1 mole of C atoms weighs 12.0 g and has 6.02 x 10 23 atoms.
The Moon travels around the Earth. The Moon travels around the Earth in a circle called an orbit. How long does it take the Moon to orbit the Earth? The Moon takes about 27 days (27 days, 7 hours, 43 minutes, 11.6 seconds) to go all the way around the Earth and return to its starting position. The Moon's orbit around the Earth is a slightly squashed circle called an ellipse.
If you ignore the earth's orbit around the sun, the moon takes 27.32 days to go 360 degrees around us. In other words, the time it takes to cover 360 degrees of the celestial sphere. But since we orbit the sun, the moon has to travel farther than 360 degrees to reach the same point, with respect to the earth and sun. (It's about an extra 28 degrees). Since we notice phases much more than what stars we see the moon against, the phase cycle of 29.5 days is the one most commonly used.