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3 years ago

At the carnival, a baby was given a helium balloon whose

Chemistry

1 answer:

Pani-rosa [81]3 years ago

8 0

Answer: 0.048 kPa

Explanation: no clue i just looked it up you’re welcome y’all:)

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Magnesium fluoride is used in the ceramics and glass industry. What is the mass of 1.72 mol of magnesium fluoride?

lions [1.4K]

Answer:

107g

Explanation:

Magnesium fluoride (MgF₂) has a molecular mass of:

Mg: 24,305 g/mol × 1 = 24,305 g/mol

F: 18,998 g/mol × 2 = 37,996 g/mol

MgF₂ = 24,305g/mol + 37,996g/mol = 62,301g/mol. That means the mass of 1,72 mol of MgF₂ is:

1,72 mol F₂ × (62,301g / 1mol) = 107g

I hope it helps!

5 0

3 years ago

Students are completing a table about a particular subatomic particle that helps make up an atom.

defon

Answer: option B.with “Inside the nucleus,” because the particle is a neutron.

Explanation:

You have to complete this table:

mass | location | charge

1 ? Has no charge

The atom is constituted by 3 subatomic particles, namely electron, proton, and neutron.

Since the gold foil experiment performed by Geiger and Marsden (1909), who collaborated with Ernest Rutherford, it was stablished that the atom contains a dense positively charged nucleus, which has almost all the mass of the atom.

The positive charge comes from the subatomic particle named proton.

A few time later, a second subatomic particle inside the nucleus, was discovered. This particle has not charge and has almost the same mass than the proton. Because the absence of charge it was named neutron.

Hence, the relative masses of the protons and neutrons are 1 / 1. As said, both are in the nucleus, and while the proton has positive charge, the neutron has no charge. So, the table is completed with inside the nucleus, because the particle is a neutron:

mass | location | charge

1 inside the nucleus Has no charge

5 0

3 years ago

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How many liters are there in 144g of H₂O (g)? What is the mass of 200L at STP of H₂O₂ (g)?

Lisa [10]

Answer:

1. 179.2 L

2. 303.62 g

Explanation:

1. Determination of volume of H₂O (g).

We'll begin by calculating the number of mole in 144 g of H₂O. This is illustrated below:

Mass of H₂O = 144 g

Molar mass of H₂O = (2×1) + 16 = 2 + 16 = 18 g/mol

Mole of H₂O =?

Mole = mass /Molar mass

Mole of H₂O = 144/18

Mole of H₂O = 8 moles

Finally, we shall determine volume of H₂O (g) as follow:

1 mole of any gas occupy 22.4L at stp.

Therefore, 8 moles of H₂O (g) will occupy =

8 × 22.4 = 179.2 L

Thus, 144 g of H₂O (g) occupies 179.2 L

2. Determination of the mass of H₂O₂ (g).

We'll begin by calculating the number of mole of H₂O₂ (g) that occupied 200 L at STP. this can be obtained as follow:

1 mole of any gas occupy 22.4 L at stp.

Therefore, Xmol of H₂O₂ (g) will occupy 200 L at STP i.e

Xmol of H₂O₂ (g) = 200/22.4

Xmol of H₂O₂ (g) = 8.93 moles

Thus, 8.93 moles of H₂O₂ (g) occupied 200 L at STP.

Finally, we shall determine the mass of H₂O₂ (g) as follow:

Mole of H₂O₂ (g) = 8.93 moles

Molar mass of H₂O₂ = (2×1) + (2×16) = 2 + 32 = 34 g/mol

Mass of H₂O₂ =?

Mole = mass /Molar mass

8.93 = mass of H₂O₂ /34

Cross multiply

Mass of H₂O₂ = 8.93 × 34

Mass of H₂O₂ = 303.62 g

5 0

3 years ago

Which best describes how equations are used in science?

Georgia [21]

C, equations use symbols to represent data

6 0

3 years ago

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What is the atom number of helium

Maksim231197 [3]

The atomic number of helium is 2

3 0

3 years ago

Read 2 more answers