What mass of nh3 can be made from 35.0 grams of n2?
n2 + 3h2 → 2nh3
a. 42.5 grams
b. 70.0 grams
c. 17.5 grams

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Idont understand by supporting the plant and holding the leaves up to the light. question 3 options: tap or fibrous root flower petals herbaceous or wood stems leaves with stomata

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different