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3 years ago

14

How many carbons are in a molecule of hexane? a. 2 b. 4 c. 6 d. 8

1 answer:

trasher [3.6K]3 years ago

3 0

C.6 because the prefix hex

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A solution is prepared at 25 °C that is initially 0.23 M in propanoic acid, a weak acid with K, = 1.3 x 10^-5, and 0.42 M in sod

xenn [34]

Answer:

$\large \boxed{5.15}$

Explanation:

HA + H₂O ⇌ H₃O⁺ + A⁻

1. Calculate pKₐ

$\text{p}K_{\text{a}} = -\log \left (K_{\text{a}} \right ) =-\log(1.3 \times 10^{-5}) = 4.89$

2. Calculate the pH

We can use the Henderson-Hasselbalch equation to get the pH.

$\begin{array}{rcl}\text{pH} & = & \text{pK}_{\text{a}} + \log \left(\dfrac{[\text{A}^{-}]}{\text{[HA]}}\right )\\\\& = & 4.89 +\log \left(\dfrac{0.42}{0.23}\right )\\\\& = & 4.89 + \log1.83 \\& = & 4.89 +0.261\\& = & 5.15\\\end{array}\\\text{The pH of the buffer is $\large \boxed{\mathbf{5.15}}$}$

4 0

2 years ago

Driving to work one morning, you get a flat tire. When using the car jack, you apply 120 N of force to the jack and the jack in

svetlana [45]

16.7

Explanation:

Given parameters:

Force applied to Jack = 120N

Force produced by Jack = 2000N

Unknown:

Mechanical advantage of jack = ?

Solution:

Mechanical advantage is the ratio of force produced by the device and the force applied on it.

It is used to access the performance of a machine.

M.A = \frac{force output}{force input}

Now input the parameters;

M.A = $\frac{2000}{120}$

M.A = 16.7

learn more:

Force brainly.com/question/10470406

#learnwithbrainly

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3 years ago

What do all properties of matter have in common

Wewaii [24]

Answer:

they all matter

Explanation:

cause you matter :)

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2 years ago

Read 2 more answers

Please can someone help I will mark brainiest!

vazorg [7]

Answer:

2Cl- ⇒ Cl ↓2+ 2e

Explanation: sorry if this is not what you were looking for.

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3 years ago

Please help with this question ;/

aev [14]

The link above is a hacker

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2 years ago