A sample of phosphonitrilic chloride, PNCl2, contains 1.89 mol of the compound. Determine the amount (in mol) of each element present and the number of atoms of each element present in the sample.
Element
Moles
Atoms
P
N
СІ

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

Which type of reaction involves the absorption of energy from the surroundings?

How long does it take light from the nearest star other than the sun to reach earth? a) less than 1 second b) about 1 hour c) about 1 month d) about 4 years