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Nezavi [6.7K]
3 years ago
8

For most substances, the distance between the particles is smallest when the substance

Chemistry
1 answer:
olchik [2.2K]3 years ago
3 0
Is a solid? has strong intermolecular forces? 
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The density of methanol is 0.7918g/mL. Calculate the mass of 89.9mL of this liquid.
Novosadov [1.4K]
The mass is 71.2 g.

Mass = 89.9 mL × \frac{0.7918 g}{1 mL} = 71.2 g
4 0
3 years ago
A 25.0-mL sample of 0.150 M hydrazoic acid, HN3, is titrated with a 0.150 M NaOH solution. What is the pH after 13.3 mL of base
tamaranim1 [39]

Answer:

pH ≅ 4.80

Explanation:

Given that:

the volume of HN₃ = 25 mL = 0.025 L

Molarity of HN₃ = 0.150 M

number of moles of HN₃ = 0.025 × 0.150

number of moles of HN₃ =  0.00375  mol

Molarity of NaOH = 0.150 M

the volume of NaOH = 13.3 mL = 0.0133

number of moles of NaOH = 0.0133× 0.150

number of moles of NaOH = 0.001995 mol

The chemical equation for the reaction of this process can be written as:

HN_3 + OH- ---> N^-_{3} + H_2O

1 mole of hydrazoic acid react with 1 mole of hydroxide to give nitride ion and water

thus the new number of moles of HN₃ = 0.00375 - 0.001995 = 0.001755 mol

Total volume used in the reaction =  0.025 +  0.0133 = 0.0383  L

Concentration of HN_3 = \dfrac{0.001755}{0.0383} = 0.0458 M

Concentration of N^{-}_3 = \dfrac{ 0.001995 }{0.0383} = 0.0521 M

GIven that :

Ka = 1.9 x 10^{-5}

Thus; it's pKa = 4.72

pH =4.72 +  log(\dfrac{ \ 0.0521}{0.0458})

pH =4.72 + log(1.1376)

pH =4.72 + 0.05598

pH =4.77598

pH ≅ 4.80

3 0
3 years ago
Which organ is found in the excretory system?
Lemur [1.5K]

Answer:

urethra

Explanation:

6 0
3 years ago
Why do electrons enter the 4s orbital before entering the 3d orbital?
Allisa [31]
Because that is the outer ring.
6 0
3 years ago
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A student makes the following hypothesis: If the amount of chocolate increases then the cake will taste sweeter. What is the ind
Talja [164]

Answer:

the chocolate

Explanation:

You are changing the amount of chocolate

8 0
3 years ago
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