It's b. hydrogen bonds between water molecules
A rectangle box measures 6.00 in. in length, 7.00 in. in width, and 8.00 in. in height. The volume of the rectangular box is 5.506 L
Given,
1 inch = 2.54 cm
Length = 6.00 inches = 6.00 x 2.54 cm = 15.24 cm
Width = 7.00 inches = 7.00 x 2.54 cm = 17.78 cm
Height = 8.00 inches = 8.00 x 2.54 cm = 20.32 cm
Now,
Volume of rectangular box = Length x Width x Height
= 15.24 cm x 17.78 cm x 20.32 cm
= 5506.05 cm3
= 5506.05 mL (\small \because 1 cm3 = 1 mL)
= 5.506 L (\small \because 1000 mL = 1 L)
Hence, the volume of rectangular box is 5.506 L.
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Explanation:
v=3.0L (to calculate M, volume must be in L)
n=4.0 moles
M=n/v (formula molarity)
=4.0/3.0
=1.333M
pH at the equivalence point is 3.60
<h3>
Define pH.</h3>
pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions are. The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 
gram-equivalents per liter, into numbers between 0 and 14. The hydrogen ion concentration in pure water, which has a pH of 7, is 
gram-equivalents per liter, making it neutral (neither acidic nor alkaline). A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.
given that,
HNO2 = 0.100M
KOH= 0.200M
pKa = 3.34
using formula,
pH = pKa + log (salt /acid)
= 3.34 + log (0.200/0.100)
= 3.34 + log 2
= 3.34 + 0.30
= 3.60
pH at the equivalence point is 3.60
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