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3 years ago

Fill in the missing spaces in the chart. Will give brainliest.

Chemistry

1 answer:

lana [24]3 years ago

3 0

Explanation:

9/4 Be +2 (the 9 and 4 are stacked next to Be). Atomic #: 4

Mass #: 9, # protons: 4, # neutrons: 5, #electrons: 2.

31/15 P (31 is stacked over 15 next to the P). Atomic #: 15,

Mass #: 31, # protons: 15, # neutrons: 16, # electrons: 15.

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LuckyWell [14K]

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Explanation:

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3 years ago

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Calculate the mass of iron(III) oxide that contains a million iron atoms. Be sure your answer has a unit symbol if necessary, an

KiRa [710]

<u>Answer:</u> The mass of iron (II) oxide that contains a million iron atoms is $2.6\times 10^{-17}g$

<u>Explanation:</u>

We are given:

Number of iron atoms = A million = $1.0\times 10^6$

The chemical formula of the given compound is $Fe_2O_3$

It is formed by the combination of 2 iron atoms and 3 oxygen atoms.

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of particles

1 mole of iron (II) oxide will contain = $(2\times 6.022\times 10^{23})=1.2044\times 10^{24}$ number of iron atoms

We know that:

Molar mass of iron (II) oxide = 159.7 g/mol

Applying unitary method:

For $1.2044\times 10^{24}$ number of iron atoms, the mass of iron (II) oxide is 159.7 g

So, for $1.0\times 10^6$ number of iron atoms, the mass of iron (II) oxide will be $\frac{159.7}{1.2044\times 10^{24}}\times 1.0\times 10^6=2.6\times 10^{-17}g$

Hence, the mass of iron (II) oxide that contains a million iron atoms is $2.6\times 10^{-17}g$

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4 years ago

The azimuthal quantum number, ℓ, represents the:

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3 years ago

PLEASE HELP ME!!!!!! IF ANYONE HAS ALL THE ANSWERS TO THE HUMAN BODY TEST ON USATP FROM K12 ONLINE SCHOOL PLEASE LET ME KNOW THE

jasenka [17]

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Explanation:

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3 years ago

A sample of propane, C3H8, occupies 1.73 mL when the pressure is 320 torr at 30 C. What is the volume at STP

hammer [34]

The volume of the sample of propane at STP is 0.62 mL.

<h3>What is volume?</h3>

Volume is the amount of space that a substance or object occupies.

To calculate the volume of gas at STP, we apply the formula below.

Formula:

PV/T = P'V'/T'................. Equation 1

Where:

P = Initial pressure of gas
V = Initial volume of gas
T = Initial temperature of gas
P' = Standard pressure (SP)
T' = Standard temperature (ST)
V' = Volume of gas at STP.

Make V' The subject of the equation

V' = PVT'/P'T.............. Equation 2

From the question,

Given:

P = 320 torr
V = 1.73 mL
T = 30 °C = (30+273) K = 303 K
P' = 760 torr
T' = 273 K

Substitute these values into equation 2

V' = (320×1.73×273)/(760×303)
V' = 0.62 mL

Hence, the volume of the sample of propane at STP is 0.62 mL.
Learn more about volume here: brainly.com/question/26507715

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2 years ago