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3 years ago

Which of the following object has the LESS momentum?

Chemistry

1 answer:

Nady [450]3 years ago

8 0

A train with a velocity of 0 m/s because it literally isn’t moving

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a 68 ml aliquot of a 1.4M solution is diluted to a total volume of 288 ml a 144 ml portion of that solution is diluted by adding

vova2212 [387]

Answer:

$0.1501\ \text{M}$

Explanation:

$68\times 10^{-3}\times 1.4=0.0952\ \text{mol}$

Concentration in solution

$\dfrac{95.2}{288}=0.3305\ \text{M}$

After dilution

$144\times 0.3305=47.592\ \text{mmol}$

Total volume $=144+173=317\ \text{mL}$

Final concentration $=\dfrac{47.592}{317}=0.1501\ \text{M}$

The final concentration is $0.1501\ \text{M}$

6 0

3 years ago

True or false <br> Bacteria can only be found in a few places on the planet.

frez [133]

Answer:

I think false

Explanation:

It might be false because bacteria can be found on hard/soft surfaces, in our bodies, in the ground, and in the air.

8 0

3 years ago

Calculate the number of molecules in 7 moles of oxygen

Alexxandr [17]

Answer:

4.21

Explanation:

use Avogadro's number

6.023 x 10^23

multiply this by 7 because you want to find 7 moles :

6.023 x 10^23 x 7 = 4.21

3 0

3 years ago

In a mixture of n2 and o2 gases, the mol fraction of n2 is found to be 0.700. the total pressure of the mixture is 1.42 atm. wha

vova2212 [387]

Easy the partial pressure is the 0.9883 as the linguistic compound of the average element of the shell is the same as the boron

8 0

3 years ago

Thirty grams of potassium chloride crystals are added to 400 mL of water. What is the molarity of this potassium chloride soluti

photoshop1234 [79]

Answer:

Molarity of potassium chloride is:

A. 1.0 M

Explanation:

Molarity is used to express the concentration of the solution.It is defined as the moles of solutes per liter volume of solution.It is denoted by M.

$molarity(M)=\frac{moles\ of\ solute}{volume\ of\ solution(ml)}\times 1000$

$M=\frac{n}{V(ml)}\times 1000$

Here'n' is the number of moles. It can be calculated using formula:

$n=\frac{given\ mass(w)}{molar\ mass}$

given mass=30 gm

Molar mass of KCl = mass of K+mass of Cl

= 39.098+34.45

= 74.55 g

$n=\frac{30}{74.55}$

n = 0.402 moles

$M=\frac{n}{V(ml)}\times 1000$

$M=\frac{0.402}{400}\times 1000$

$M=\0.001\times 1000$

M=1.00 M

So molarity of potassium chloride is 1.00 M

5 0

4 years ago