20 grams of hydrogen reacted with oxygen to form 36 grams of H20 (water). How many grams of oxygen were used up in this reaction? I need the answer in less 3 hours so plz plz help m

What is the result of multiplying (2.5 × 1010) × (2.0 × 10-7)? a. 5.0 × 103 b. 5.0 × 10-3 c. 5.0 × 1017 d. 5.0 × 10-17

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

What type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? view available hint(s) what type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? salt bridge disulfide bridge hydrogen bond hydrophobic interaction