How many moles are in 1.23 x 1024 atoms of Calcium (Ca)?

2. you__turn left on a red light if you are in the left-most lane of a one-way street, you're turning into the left-most lane of a one-way street, and no nearby sign prohibits the turn.

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?