To measure the amount of chlorine in a well-boring fluid, an analytical chemist adds 0.210 M silver nitrate (AgNO3) solution to a 30.00 g sample of the fluid and collects the solid silver chloride (AgCl) product. When no more AgCl is produced, he filters, washes and weighs it, and finds that 1.3 g has been produced. The balanced chemical equation for the reaction is: Cl-(aq)+AgNO3(aq)-->AgCl(s)+NO3- (aq)
Calculate the mass percent of Cl in the sample. Be sure your answer has the correct number of significant digits.

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

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