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3 years ago

4. What is the molar mass of NO?

Chemistry

1 answer:

raketka [301]3 years ago

7 0

Answer:

Nitrogen is a chemical element that has the symbol N and atomic number 7 and atomic mass 14.00674µ.

Explanation:

You might be interested in

How many atoms of each element are in the following compound: C3H5(NO3)3

S_A_V [24]

Answer:

Hydrogen: 5

Carbon:3

Nitrogen:3

Oxygen: 9

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6 0

2 years ago

The pressure inside a gas cylinder is 3,506 mmHg. How many atmospheres of pressure is the gas exerting on the cylinder?

PSYCHO15rus [73]

Below are the choices:

a)0.2168 atm
b)4.613 atm 
c)34.60 atm 
d467.4 atm

1 atm = 760mmHg : Therefore:
3,506mmHg = 3,506/760 = 4.613 atm
B is correct answer.

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7 0

3 years ago

Read 2 more answers

Two or more substances in variable proportions, where the composition is variable throughout are a a homogeneous mixture. b a so

REY [17]

Answer: In heterogeneous mixture, the composition remains variable throughout.

Explanation:

For the given options:

Homogeneous mixtures are defined as the mixtures that appears uniformly throughout the solution and the particle size or shapes are not different. The composition remains constant throughout.

A solution is defined as the solution in which the components gets completely dissolved in it. Particles are evenly spread in these solutions. These solution does not scatter light falling on it. The composition remains constant throughout.

An amorphous solid is defined as the solid in which the constituent particles of the matter are arranged in the random manner. The composition remains constant throughout.

A heterogeneous mixture is defined as the mixture in which component are unevenly spread throughout the solution. The size and shape of the particles differ in these mixtures. These mixture scatter the light falling on it. The composition do not remains constant throughout.

Compound is defined as the chemical specie which is formed by the combination of two or more different type of atoms. For Example: $H_2O,O_2$ etc...The composition remains constant throughout.

Hence, in heterogeneous mixture, the composition remains variable throughout.

4 0

4 years ago

Copper has two naturally occurring isotopes, 63Cu (isotopic mass 62.9296 amu) and 65Cu (isotopic mass 64.9278 amu). If copper ha

Semenov [28]

Answer:

Percentage of first isotope = 69.152 %

Percentage of second isotope = 30.848 %

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})$

Given that:

For first isotope:

Let % = x %

Mass = 62.9296 amu

For second isotope:

% = 100 - x % (Since, there are only two isotopes)

Mass = 64.9278 amu

Average mass = 63.546 amu

Thus,

$63.546=\frac {x}{100}\times {62.9296}+\frac {(100-x)}{100}\times {64.9278}$

Solving,

1.9982 x = 138.18

Thus,

Percentage of first isotope = x = 69.152 %

Percentage of second isotope = 100 - x % = 30.848 %

5 0

4 years ago

Given the propane molecule C3H8(g)! a) What is the balanced equation for the combustion of propane in O2?(20 pts.) b) What is th

lubasha [3.4K]

Answer:

The answer to your question is below

Explanation:

Propane = C₃H₈

Process

1.- Write the chemical reaction

C₃H₈ + O₂ ⇒ CO₂ + H₂O

balanced chemical reaction

C₃H₈ + 5O₂ ⇒ 3CO₂ + 4H₂O

Reactants Elements Products

3 C 3

8 H 8

10 O 10

b) Standard enthalpy

Propane -104.7 kJ/mol

Oxygen 0 kJ/mol

Carbon dioxide -393.5 kJ/mol

Water -241.8 kJ/mol

ΔH° = ∑ΔH° products - ∑H° reactants

ΔH° = 3(-393.5) + 4(-241.8) - [(-104.7) + 0]

-Simplification

ΔH° = -1180.5 kJ/mol - 967.2 kJ/mol + 104.7 kJ/mol

ΔH° = - 2042.5 kJ/mol

This reaction is exothermic because ΔH° is negative.

4 0

3 years ago