In a sample of 400 lithium atoms, it is found that 30 atoms are lithium-6(6.0g/mol) and 370 atoms are lithium-7(7.0g/mol). calculate the average atomic mass of lithium

219 grams of iron (iii) oxide reacts with excess carbon according to the reaction equation shown below. fe2o3 + c → fe + co2 after a scientist performs the chemical reaction they find the actual yield of iron to be 57.4 grams. calculate the percent yield of this chemical reaction.

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

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