All categories

3 years ago

To prepare 400 ml of a 40% (w/v) solution of sodium bicarbonate, how many grams of solute are needed?

Physics

1 answer:

Anna [14]3 years ago

5 0

Answer : The mass of solute needed are, 40 grams.

Explanation :

As we are given that 40 % (w/v) solution of sodium bicarbonate (solute) that means 40 grams of sodium bicarbonate present in 100 mL of solution.

Now we have to calculate the mass of solute needed.

As, 100 mL of solution needs mass of solute = 10 g

So, 400 mL of solution needs mass of solute = $\frac{400mL}{100mL}\times 10g=40g$

Thus, the mass of solute needed are, 40 grams.

You might be interested in

A 89.3 kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.77 r

balu736 [363]

Answer:

$\omega_{2} = 1.107\,\frac{rad}{s}$

Explanation:

Let assume that circular platform is a solid cylinder. Given the absence of external forces, the situation can be analyzed by applying the Principle of Angular Momentum, which states that:

$I_{1}\cdot \omega_{1} = I_{2}\cdot \omega_{2}$

The initial moment of inertia is:

$I_{1} = \frac{1}{2}\cdot (89.3\,kg)\cdot (1.69\,m)^{2}$

$I_{1} = 127.525\,kg\cdot m^{2}$

Likewise, the final moment of inertia is:

$I_{2} = 127.525\,kg\cdot m^{2} + (8.83\,kg)\cdot (1.352\,m)^{2} + (21.1\,kg)\cdot (1.69\,m)^{2}$

$I_{2} = 203.929\,kg\cdot m^{2}$

The final angular speed is:

$\omega_{2} = \frac{I_{1}}{I_{2}} \cdot \omega_{1}$

$\omega_{2} = \frac{127.525\,kg\cdot m^{2}}{203.929\,kg\cdot m^{2}} \cdot (1.77\,\frac{rad}{s} )$

$\omega_{2} = 1.107\,\frac{rad}{s}$

4 0

3 years ago

Read 2 more answers

Light strikes a flat mirror with an angle of incidence of 73º. At what angle does it reflect off at?

Montano1993 [528]

Answer:

73º.

Explanation:

4 0

3 years ago

What is most likely source of the waves approaching this coastline

hjlf

Assuming that you mean waves on the surface of a large body of water (like an ocean or lake), the most probable cause of these is the wind. The friction between the moving air and the water surface makes the water move. Hope this answers the question. Have a nice day.

4 0

3 years ago

If a woman runs 100 meters north and then 70 meters south, what is her total displacement?

Burka [1]

Displacement is the distance between the starting and ending points, in the direction from the starting point to the ending point, all regardless of the route followed from the starting point to the end point.

The woman's displacement is therefore 30 meters north.

8 0

3 years ago

Read 2 more answers

A wave travels through a medium and displaces the particles perpendicular to the direction in which the wave is traveling. This

irakobra [83]

Transverse waves are always characterized by particle motion being perpendicular to wave motion. A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction which the wave moves

5 0

3 years ago