Which of the following is a conjugate acid–base pair? a. HNO3 – , H2NO3
b. HNH4, NH4 +
c. H2F, HF–
d. HPO4 2– , PO4 3–
e. H2CN, CN–

On a distance vs time graph the line of an object at rest is a

He table below gives the atomic mass and relative abundance values for the three isotopes of element m. relative abundance (%) atomic mass (amu) 78.99 23.9850 10.00 24.9858 11.01 25.9826 what is the average atomic mass (in amu) of element m? 2.86 5.36 24.30 24.98

Answer asap need by wednesday morning calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 best answer will be brainliest