Câu 28. Khối lượng của electron tính bằng kilogam là A. me = 1,67.10–27.
B. me = 1,6.10–19.
C. me = 1,67.10–24.
D. me = 9,1.10–31

What is the empirical formula for c4h8o2

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.