HELP PLSS! A person combines 20g of hydrogen gas with some chlorine gas. They find the empirical formula of the product, and it is HCl. If they combine 120g of hydrogen gas with chlorine gas, what will the empirical formula of the product be?
1- HCl
2- Н6СІ
3- H2CI4
4- HCI4
5- Н2СІ
6- HCl2

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

Which statement is best described as a atom

The peak wavelength for the blackbody curve of a star is in the uv range. assuming the radiation from this star can reach earth, would you be able to see it?