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4 years ago

Air is made up of about 21% oxygen and 78% nitrogen.

1 answer:

6 0

I believe its A "Air is made up of about 21% oxygen and 78% nitrogen. In this solution, oxygen is the solute and nitrogen is the solvent.

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Which planet is the smallest and the closest to the Sun?

jekas [21]

Mercury is the smallest and closest plant to the sun

7 0

3 years ago

Read 2 more answers

Hat volume of a 0.540 M NaOH solution contains 12.5 g NaOH

amid [387]

Answer:

At 0.58 L of 0.540 M NaOH solution contain 12.5 g NaOH.

Explanation:

Given data:

At volume = ?

Mass of NaOH = 12.5 g

Molarity of solution = 0.540 M

Solution:

First of all we will calculate the number of moles of sodium hydroxide.

Number of moles = mass/molar mass

Number of moles = 12.5 g / 40 g/mol

Number of moles = 0.3125 mol

Volume of NaOH:

Molarity = number of moles / volume in L

Now we will put the values.

0.540 M = 0.3125 mol / volume in L

volume in L = 0.3125 mol / 0.540 mol/L

volume in L = 0.58 L

5 0

3 years ago

Be sure to answer all parts. Show the overall reaction for formation of racemic 3âˆ’bromohexane from (E)âˆ’3âˆ’hexene by enterin

Viktor [21]

Answer:

See explanation

Explanation:

The mechanism for the formation of bromohexane from hexene has been clearly shown in the image attached to this answer.

Hexene is attacked by HBr and a carbocation is first formed as shown. The carbocation is flat and planar. it can be attacked on either face by the bromide ion.

Attack on either faces yields a racemic mixture of the R and S enantiomer as shown in the image.

You can use the mechanism shown to fill in the structures.

8 0

3 years ago

An object has a kinetic energy of 25j and mass of 34kg how fast is the object moving

disa [49]

$KE= \frac{1}{2} mv^2$

KE- kinetic energy
m - mass
v- velocity

6 0

4 years ago

If a carbon atom is bonded to two hydrogen atoms and two carbon atoms

Nataliya [291]

Answer:

That molecule is a propane.

Explanation:

Look at the scheme

H3C --------- ------ H

H3C --------- ------- H

C3H8

3 0

3 years ago