Calculate the number of moles of gold present in an engagement ring that is made of 4 carats of gold, Au. (1 carat is equivalent to 0.25g). (RAM Au: 197)

Which change in temperature is the smallest? a change of 1 thomson degree a change of 1 kelvin degree a change of 1 fahrenheit degree a change of 1 celsius degree

Complete each row of the table below by filling in the missing prefix or missing exponent.

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