When preparing aqueous solution of CuSO4 students A and B weighed the pentahydrate salt CuSO4x5H2O. For calculation of molarity of their solutions student A used molar mas of the pentahydrate salt while student B used the molar mass of the anhydrous salt CuSO4. Student C said it does not matter whether we use molar mass of the pentahydrate salt or of anhydrous salt. Which of these 3 students was right

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

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Asap! will give brainiest when a heat wave strikes a region causing more people to run air-conditioning units, electrical demand increases. what needs to be done to meet this increased demand? raising the control rodslowering the control rodsremoving the control rods