A gold chain has a volume of 4cm3. The density of gold is 19.3 g/cm3. Calculate the mass of the gold chain. Which one is it ? -4.8 grams

-23.3 grams

-0.21 grams

-77.2 grams

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world