Which of the following functions as a regulatory protein by dephosphorylating activated enzymes?

a. Sos protein
b. guanine nucleotide exchange factor
c. receptor tyrosine kinase
d. phosphoprotein phosphatase
e. heterotrimeric G protein phosphorylase

calculate how many grams of ammonia can be produced from 4.21 grams of

n2 + 3h2 = 2nh3

my answer:

25.0g n2 x (1 mol/ 28.0gn2) x (2 mol nh3/ 1 mol n2) x (17.0g nh3/ 1 molnh3) = 30.36g n2

25.0g h2 x (1 mol h2/ 2.00g h2) x (2 mol nh3/ 3 mol h2) x (17.0g nh3/ 1 mol nh3) = 141.67g h2

lr = n2

i think   the answer is c hope i'm right

the answer is option a.

a