Chemistry, 17.08.2020 14:01 mewashere1234

A flask contains 0.25 naoh. what mass of naoh is present per dm3 of solution

Answers: 2

Show answers

Answers

Answer from: Kemosdasavage

The mass of NaOH in 0.25 M sample has been $\rm\bold{ 30\;g/dm^3}$ .

The molarity has been defined as moles of sample present in a liter of solution.

The molarity of given NaOH solution has been 0.25 M. It has been stating that 0.25 moles of NaOH has been present in a liter of solution.

The mass of sample present in 1 cubic decimeter has been the mass of sample in a liter of solution as:

$\rm 1\;dm^3=1\;L$

The molarity (M) has been given as:

$M=\dfrac{\text {mass}}{mwt}\;\times\;\dfrac{1}{V(L)}$

Where, the molarity of NaOH sample has been, $M=0.25\;\text M$

The molar mass of NaOH has been, $mwt=40\;\text {g/mol}$

The volume of solution has been, $V=3 \;\text L$

Substituting the values for mass of NaOH:

$0.25=\dfrac{mass}{40}\;\times\;\dfrac{1}{3} \\mass=0.25\;\times\;40\;\times\;3\\mass=30\;\text g$

The mass of NaOH in 0.25 M sample has been $\rm\bold{ 30\;g/dm^3}$ .

For more information about molarity, refer to the link:

link

Answer from: jettskii214

30 g 0f NaOH.

Explanation:

The following data were obtained from the question:

Molarity of NaOH = 0.25 M

Volume = 3 dm³

Mass of NaOH =?

Next, we shall determine the number of mole of NaOH present in 3 dm³ of 0.25 M NaOH solution.

This can be obtained as follow:

Molarity of NaOH = 0.25 M

Volume = 3 dm³

Mole of NaOH =?

Molarity = mole /Volume

0.25 = mole of NaOH/3

Cross multiply

Mole of NaOH = 0.25 × 3

Mole of NaOH = 0.75 mole

Finally, we shall determine the mass of NaOH as follow:

Mole of NaOH = 0.75 mole

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mass of NaOH =.?

Mole = mass /Molar mass

0.75 = mass of NaOH /40

Cross multiply

Mass of NaOH = 0.75 × 40

Mass of NaOH = 30 g

Therefore, 30 g 0f NaOH is present in the flask.

Answer from: Quest

Idid the calculation and i get 875,000,000 which can be written as 8.75 x 10^6?

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Another question on Chemistry

Chemistry, 22.06.2019 01:30

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?

Answers: 1

Answer

Chemistry, 22.06.2019 05:30

Describe the interaction that occurs between two objects with the same electrical charge.

Answers: 1

Answer

Chemistry, 22.06.2019 07:40

22. a flask containing 450 ml of 0.50 m h2so4 was accidentally knocked to the floor. how many grams of nahco, do you need to put on the spill to neutralize the acid according to the following equation: h2so4(aq)+2 nahcos(aq) na,so(aq) +2 h20()+2 co2(g) d) 38 g a) 2.3 g b) 9.5 g c) 19 g

Answers: 1

Answer

Chemistry, 22.06.2019 18:00

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.

Answers: 1

Answer

You know the right answer?

A flask contains 0.25 naoh. what mass of naoh is present per dm3 of solution...

Questions