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KengaRu [80]
3 years ago
14

Which of the following is a postulate of the kinetic-molecular theory of gases? (1) The distance between gas molecules is large

in comparison to their size. (2) At a given temperature, all gases have the same average velocity. (3) Gas molecules are in constant, random motion.
Chemistry
1 answer:
Yuri [45]3 years ago
7 0

Answer:

(1) The distance between gas molecules is large in comparison to their size

Explanation:

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A sample of 8.00 g of Mg(OH)2 is added to 24.2 mL of 0.205 M HNO3. How many moles of Mg(OH)2 our present after the reaction is c
kogti [31]

The amount of Mg(OH)2  present after the reaction is complete is 0.136 moles of Mg(OH)2.

The equation of the reaction is;

2HNO3(aq) + Mg(OH)2(aq) -------> Mg(NO3)2(aq) + 2H2O(l)

Number of moles of Mg(OH)2 = 8.00 g/58 g/mol = 0.138 moles

Number of moles of HNO3 = 0.205 M × 24.2 mL/1000 = 0.00496 moles

Given that;

2 moles of HNO3 reacts with 1 mole of Mg(OH)2

0.00496 moles of HNO3 reacts with 0.00496 moles ×  1 mole /2 moles = 0.00248 moles of Mg(OH)2

Hence, Mg(OH)2 is the reactant in excess.

The amount of Mg(OH)2 remaining = Amount present - Amount reacted

Hence; 0.138 moles - 0.00248 moles = 0.136 moles of Mg(OH)2

Learn more: brainly.com/question/9743981

6 0
2 years ago
The amount of heat absorbed by the alcohol was determined to be 1.17kJ. Given that the specific heat of the alcohol is 2.42J/gC
quester [9]

Answer:

                      ΔT  =  20.06 °C

Explanation:

The equation used for this problem is as follow,

                                    Q  =  m Cp ΔT   ----- (1)

Where;

           Q  =  Heat  =  1.17 kJ = 1170 J

           m  =  mass  =  24.1 g

           Cp  =  Specific Heat Capacity  =  2.42 J.g⁻¹.°C⁻¹

           ΔT  =  Change in Temperature  =  <u>??</u>

Solving eq. 1 for ΔT,

                                ΔT  =  Q / m Cp

Putting values,

                                ΔT  =  1170 J / 24.1 g × 2.42 J.g⁻¹.°C⁻¹

                                ΔT  =  20.06 °C

6 0
3 years ago
Which layer of Earth has partially melted material that moves the tectonic plates?
beks73 [17]

The layer of Earth that has partially melted material that moves the tectonic plates is Mantle.  The correct option is C.

<h3>What are the layers of the Earth?</h3>

The Earth is divided into three layers: the crust, the mantle, and the core. This is the earth's outer layer, and it is composed primarily of solid rock, primarily basalt and granite. Oceanic crust and continental crust are the two types of crust.

The layer of Earth that has partially melted material that moves the tectonic plates is Mantle.

Thus, the correct option is C.

For more details regarding Layers of Earth, visit:

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6 0
2 years ago
The primary role of the nervous system is to:
Scrat [10]
Gather and respond to information
3 0
2 years ago
What is the atomic number for an element whose mass number is 78,
Ann [662]

Answer:

protons = atomic numbermass number = protons + neutronsatomic number = mass number - neutrons = 78-38 = 40

Explanation:

5 0
2 years ago
Read 2 more answers
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