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3 years ago

5

M is a mysterious element whose molar mass is 141.0 g/mol. When combined with oxygen, the formula of the compound is M2O5. What

is the percent of M in the compound?

1 answer:

Alex Ar [27]3 years ago

7 0

Answer:

I d k

Explanation:

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Suppose you take a trip to a distant universe?...

zheka24 [161]

<span>a. the orbital is defined by n,L, mL so (n, L, mL, -1), (n, L,mL, 0) and (n,L,mL, +1) and 3 electrons for any given orbital

b. in (n,L,mL,ms) format the first 12 elements would look like this

(1, 0, 0, +1)
(1, 0, 0, 0)
(1, 0, 0, -1)
(2, 0, 0, +1)
(2, 0, 0, 0)
(2, 0, 0, -1)
(2, 1, 0, +1)
(2, 1, 1, +1)<-----ANSWER
(2, 1, 0, 0)
(2, 1, 1, 0)
(2, 1, 0, -1)
(2, 1, 1, -1)
the idea is we don't pair up electrons until all the mL's have 1 so we wouldn't write
(2, 1, 0, +1)
(2, 1, 0, 0)
(2, 1, 0, -1)
then.
(2, 1, 1, +1)
(2, 1, 1, 0)
(2, 1, 1, -1)
because they would fill
(2, 1, 0, +1)1st
(2, 1, 0, 0)3rd
(2, 1, 0, -1)5th
then.
(2, 1, 1, +1)2nd
(2, 1, 1, 0)4th
(2, 1, 1, -1)6th
to pair (or rather triple up) electrons last
c. ideal gases are when each n level is full...
(1, 0, 0, +1)
(1, 0, 0, 0)
(1, 0, 0, -1)<----- ideal gas 3 electrons so 3 protons and atomic # = 3
(2, 0, 0, +1)
(2, 0, 0, 0)
(2, 0, 0, -1)
(2, 1, 0, +1)
(2, 1, 1, +1)
(2, 1, 0, 0)
(2, 1, 1, 0)
(2, 1, 0, -1)
(2, 1, 1, -1)<----- 2nd ideal gas12 e's so 12 p's and atomic # = 12

continuing on
(3, 0, 0, +1)
(3, 0, 0, 0)
(3, 0, 0, -1)
(3, 1, 0, +1)
(3, 1, 1, +1)
(3, 1, 0, 0)
(3, 1, 1, 0)
(3, 1, 0, -1)
(3, 1, 1, -1)..
(3, 2, 0, +1)
(3, 2, 1, +1)
(3, 2, 2, +1)
(3, 2, 0, 0)
(3, 2, 1, 0)
(3, 2, 2, 0)
(3, 2, 0, -1)
(3, 2, 1, -1)
(3, 2, 2, -1)<--- 3rd nobel gas atomic # = 30
hope it helps
</span>

5 0

3 years ago

Read 2 more answers

Sodium is a shiny metal. When cut, it dulls quickly. It also reacts violently with water. Which of the following would probably

siniylev [52]

Answer:

jhgjghjghjghjgjhgjhgjhghjg

Explanation:

i need a crown

3 0

3 years ago

A solution of H2SO4(aq) with a molal concentration of 4.80 m has a density of 1.249 g/mL. What is the molar concentration of thi

Naddika [18.5K]

Imagine we have <span>mass of solvent 1kg (1000g)
According to that: </span> $molality =n(solute) / m(solvent) =\ \textgreater \ 4.8m = 4.8mole / 1kg$
= 4.8 mole * 98 g/mole = 470g
$m(H2SO4) = n(H2SO4)*Mr(H2SO4) =\ \textgreater \$ $=\ \textgreater \ Molarity = 4.8 mole / 1.2 L = 4 M$ m(H2SO4) which is =<span>470g

</span><span>m(solution) = m(H2SO4) + m(solvent) = 470 + 1000 = 1470 g
d(solution) = m(solution) / V(solution) =>
=> 1.249 g/mL = 1470 g / V(solution) =></span>
$Molarity = n(solute) / V(solution) =\ \textgreater \$

5 0

3 years ago

Isotopes- PLEASE HELLPP!!! It’d be much more appropriated if you added an explanation so I understand rather than just an answer

pentagon [3]

Answer:

13.

a.Atomic number of cadmium is 48

b.Number of protons = 48

c.Mass number = 115 u

d.Number of neutrons=67

e.Isotopic Symbol= $_{115}^{48}\textrm{Cd}$

14. Elements which are isotopes are:

A ,C and E
B and D

Explanation:

13.

a.Atomic number(Z):The number of protons present in the nucleus of the atom. Every element have fixed characteristic atomic number which decides its chemical property.It is represented by Z

for example : hydrogen atomic no. is 1 ,He is 2

So Cadmium has attained 48 atomic number.

b.Number of protons = Atomic number of the element

The atomic number of Cadmium is 48. Hence

Number of protons in Cadmium=48

c.Mass number(A) = Total number of protons and neutrons present in the nucleus of the atom.It is represented by A

Mass number = number of proton + number of neutron.....(1)

Cadmium has mass number of 115

d.Using equation (1),

Number of neutron = mass number - number of proton

Number of protons in Cadmium=48

Cadmium has mass number = 115

Number of neutron = 115 - 48

=67

e.The format of symbolic representation of elements is given below

$_{Z}^{A}\textrm{X}$

where X=symbol of element

Z= Atomic number

A= mass number

For Cadmium , X = Cd,Z = 48 , A =115

Symbol= $_{48}^{115}\textrm{Cd}$

(Since this is isotope of cadmium hence it is isotopic symbol)

14.

Isotopes: These are the species which have same number of protons(or atomic number) but different number of neutrons(mass number).

A ,C and E have same number of proton = 22 but different mass number. mass number :A =55,C=56 and E=58

So A ,C and E are isotopes

B and D have same number of proton = 25 but different mass number

mass number: B=55 ,D=57

B and D are isotopes

5 0

3 years ago

A sample of neon occupies a volume of 478 mL at STP. What will be the volume of the neon when the pressure is reduced to 93.3 kP

Andre45 [30]

The volume of neon when the pressure is reduced to 93.3 kPa is 519 mL.

Explanation:

The kinetic theory of gases is mostly based on Boyle's law. From the Boyle's law, the pressure experienced by any gas molecules is inversely proportional to volume of the gas molecules. Also this inverse relation is obeyed if and only if the number of moles and temperature of the gas molecules remained constant.

So, $P=\frac{1}{V}$

So if there is a change in pressure then there will be inverse change in volume. That means if there is decrease in the pressure of gas molecules then there will be increase in the volume and vice versa.

So the Boyle's law is combined as $P_{1} V_{1} = P_{2} V_{2}$

As here the initial pressure or $P_{1}$ is 1 atm or 101.3 kPa and the initial volume is 478 mL. Similarly, the final pressure is 93.3 kPa and the final volume will be

$101.3*10^{3}*478*10^{-3} = 93.3*10^{3} * V_{2}$

$V_{2} = 519 mL$

So, the volume of neon when the pressure is reduced to 93.3 kPa is 519 mL.

5 0

4 years ago