c. 0.34 M hydrocyanic acid + 0.27 M sodium cyanide .
Explanation:
A buffer is defined as the aqueous mixture of a weak acid with its conjugate base or vice versa. Based on the systems:
a. 0.12 M calcium hydroxide + 0.29 M calcium bromide. <em>IS NOT A GOOD BUFFER SYSTEM </em>because Ca(OH)₂ is a strong base.
b. 0.25 M perchloric acid + 0.16 M sodium perchlorate. <em>IS NOT A GOOD BUFFER SYSTEM </em>because perchloric acid is a strong acid
c. 0.34 M hydrocyanic acid + 0.27 M sodium cyanide. <em>IS A GOOD BUFFER SYSTEM </em>because HCN is a weak acid, and its conjugate base, CN⁻, is obtained in the dissolution of NaCN as Na⁺ and CN⁻ ions.
For one mole of hydrogen, H, the atomic mass is 1 g per mole. Hydrogen contains 1 proton and zero neuton. A neutral atom of hydrigen also contains 1 electron.
if you weigh 100 pounds on Earth, you would weigh only 38 pounds on Mercury. That's because Mercury weighs less than Earth, and therefore its gravity would pull less on your body. If, on the other hand, you were on heavy Jupiter, you would weigh a whopping 253 pounds!
