Many chemical processes involve substances in either the liquid or the gaseous state. Which of the following statements is correct?
A. A specific mass of a gas has a fixed volume at room temperature
B. A specific mass of a liquid has a fixed volume at room temperature
C. 25 cm of gas contains more particles than 25 cm of liquid
D. Liquid particles placed inside a sealed container have fixed positions
[1 mark]

Which other elements contain the same number of outer electrons as sodium

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.

How many moles of sulfur dioxide are in 2.26 × 10^33 sulfur dioxide molecules?