3 years ago

What does one mole of H2O correspond to?

Chemistry

2 answers:

Andrei [34K]3 years ago

8 0

Answer: A

Explanation:

emmasim [6.3K]3 years ago

3 0

Answer:

Its A

Explanation:

Just took the test and got a 100%

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What is Kb for N2H4 if the pH of a 0.158M solution of N2H5Cl is 4.5?

olasank [31]

Answer:

Kb $= 1.58 * 10^{-6}$

Explanation:

The correct question is

What is Kb for N2H4 if the pH of a 0.158M solution of N2H5Cl is 4.5?

Solution-

N2H4Cl hydrolyses on addition of water

The reaction equation is as follows -

N2H4+ + H2O ----> N2H4 + H3O+

$Ka = \frac{K_w}{K_b} = \frac{10^{-14}}{K_b}$

pH $= 4.5$

$[H+] = 10^{-pH} = 10^{-4.5}$

$K_b= \frac{10^{-14} }{K_b} = \frac{Y_2}{0.158} \\K_b= \frac{(10^{-4.5})^2}{0.158}\\=> Kb = 0.158 * 10-14 /(10-4.5)2$

Kb $= 1.58 * 10^{-6}$

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2 years ago

What reaction type is depicted by the following equation? 2C2H2 + 5O2 4CO2 + 2H2O

Nonamiya [84]

The answer is combustion

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3 years ago

During which phase change does the arrangement of water molecules become more orderly?

KatRina [158]

The phase change in which the water molecules become most orderly is the freezing. This is the process of changing water as liquid to its solidified form. The process of freezing is an exothermic which means that for this to occur, heat should be removed from the system.

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3 years ago

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Billy the friendly Robot uses 50 N of force to lift a box 2 meters in the air. How much work did Billy perform?

nexus9112 [7]

Answer:

Work done, W = 100 J

Explanation:

We have, Billy the friendly Robot uses 50 N of force to lift a box 2 meters in the air.

It is required to find the work done by Billy.

Work done by an object is given in terms of force and displacement. The formula used to find the work done is given by :

$W=Fd\\\\W=50\ N\times 2\ m\\\\W=100\ J$

So, the work performed by Billy is 100 J.

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3 years ago

How many milliliters of 0.128 M nitric acid are required to neutralize 11.1 mL of 0.184 M sodium hydroxide? Answer with the corr

Llana [10]

Answer:

I think 7.72 mL

11.1/184 × 128/184=7.72

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2 years ago