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Answer:
The quantity of force is expressed by the product of mass (m) and acceleration (a). Mathematically the equation can be written as
F = ma
Where,
F= Force
m = mass
a = acceleration
When a force acts on an object the objects the objects have different effects of force. So let us know about the effects of force on an object.
Explanation:
Answer: -
- 0.348°C is the melting point of a solution in which 2.5 grams of sodium chloride is added to 230 mL of water
Explanation: -
Mass of NaCl = 2.5 g
Molar mass of NaCl = 23 x 1 + 35.5 x 1 = 58.5 g / mol
Number of moles of NaCl = Mass of NaCl / Molar mass of NaCl
= 2.5 /58.5
= 0.043 mol
230mL of water has 0.043 mol.
1000mL of water has (0.043 mol x 1000 mL ) / 230mL
= 0.187 mol
Thus molality of NaCl =0.187 m
The molal freezing point depression constant of water = 1.86 °C/m
Depression in freezing point = 1.86 °C/m x 0.187 m
= 0.348°C
Melting point = 0 - 0.348°C
= - 0.348°C
Answer:
(a).
![{ \sf{1000 \: {cm}^{3} \: contains \: 0.2 \: moles \: of \: acid}} \\ { \sf{25 \: {cm}^{3} \: contains \: ( \frac{25 \times 0.2}{1000} ) \: moles}} \\ \\ = { \sf{0.005 \: moles}}](https://tex.z-dn.net/?f=%7B%20%5Csf%7B1000%20%5C%3A%20%20%7Bcm%7D%5E%7B3%7D%20%20%5C%3A%20contains%20%5C%3A%200.2%20%5C%3A%20moles%20%5C%3A%20of%20%5C%3A%20acid%7D%7D%20%5C%5C%20%7B%20%5Csf%7B25%20%5C%3A%20%20%7Bcm%7D%5E%7B3%7D%20%20%5C%3A%20contains%20%5C%3A%20%28%20%5Cfrac%7B25%20%5Ctimes%200.2%7D%7B1000%7D%20%29%20%5C%3A%20moles%7D%7D%20%5C%5C%20%20%5C%5C%20%20%3D%20%7B%20%5Csf%7B0.005%20%5C%3A%20moles%7D%7D)
» <u>0</u><u>.</u><u>0</u><u>0</u><u>5</u><u> </u><u>moles</u><u> </u><u>of</u><u> </u><u>sulphuric</u><u> </u><u>acid</u><u> </u><u>are</u><u> </u><u>present</u><u>.</u>
(b).
from the equation:
[ 1 mole of acid reacts with 2 moles of sodium hydroxide ]
![{ \sf{1 \: mole \: of \: acid \: reacts \: with \: 2 \: moles \: of \: hydroxide}} \\ { \sf{0.005 \: moles \: of \: acid \: react \: with \: (0.005 \times 2) \: moles}} \\ { \sf{ = 0.01 \: moles}}](https://tex.z-dn.net/?f=%7B%20%5Csf%7B1%20%5C%3A%20mole%20%5C%3A%20of%20%5C%3A%20acid%20%5C%3A%20reacts%20%5C%3A%20with%20%5C%3A%202%20%5C%3A%20moles%20%5C%3A%20of%20%5C%3A%20hydroxide%7D%7D%20%5C%5C%20%7B%20%5Csf%7B0.005%20%5C%3A%20moles%20%5C%3A%20of%20%5C%3A%20acid%20%5C%3A%20react%20%5C%3A%20with%20%5C%3A%20%280.005%20%5Ctimes%202%29%20%5C%3A%20moles%7D%7D%20%5C%5C%20%7B%20%5Csf%7B%20%3D%200.01%20%5C%3A%20moles%7D%7D)
» <u>0</u><u>.</u><u>0</u><u>1</u><u> </u><u>moles</u><u> </u><u>of</u><u> </u><u>sodium</u><u> </u><u>hydroxide</u><u> </u><u>reacted</u><u>.</u>
(c).
![{ \sf{10 \: {cm}^{3} \: contains \: 0.01 \: moles \: of \: hydroxide }} \\ { \sf{1000 \: {cm}^{ 3} \: contain \: ( \frac{1000 \times 0.01}{10} ) \: moles}} \\ \\ { \sf{ = 1 \: mol \: {l}^{ - 1} }}](https://tex.z-dn.net/?f=%7B%20%5Csf%7B10%20%5C%3A%20%20%7Bcm%7D%5E%7B3%7D%20%5C%3A%20contains%20%5C%3A%200.01%20%5C%3A%20moles%20%5C%3A%20of%20%5C%3A%20hydroxide%20%7D%7D%20%5C%5C%20%7B%20%5Csf%7B1000%20%20%5C%3A%20%7Bcm%7D%5E%7B%203%7D%20%20%5C%3A%20contain%20%5C%3A%20%28%20%5Cfrac%7B1000%20%5Ctimes%200.01%7D%7B10%7D%20%29%20%5C%3A%20moles%7D%7D%20%5C%5C%20%20%5C%5C%20%7B%20%5Csf%7B%20%3D%201%20%5C%3A%20mol%20%20%5C%3A%20%7Bl%7D%5E%7B%20-%201%7D%20%7D%7D)
» <u>concentration</u><u> </u><u>is</u><u> </u><u>1</u><u> </u><u>M</u>