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3 years ago

The atomic number of an atom is equal to the number of..

Chemistry

1 answer:

frez [133]3 years ago

3 0

The answer is (E). protons.

The atomic number of an atom is equal to the number of protons in the nucleus.

I hope this helped.

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What is the volume of 62.3 g of nitrogen gas at stp?

andre [41]

Answer:

The volume of nitrogen gas at STP is 55.1 liters

3 0

2 years ago

A chemist prepares a solution of copper(II) fluoride by measuring out of copper(II) fluoride into a volumetric flask and filling

Simora [160]

The question is incomplete, here is the complete question.

A chemist prepares a solution of copper(II) fluoride by measuring out 0.0498 g of copper(II) fluoride into a 100.0mL volumetric flask and filling the flask to the mark with water.

Calculate the concentration in mol/L of the chemist's copper(II) fluoride solution. Round your answer to 3 significant digits.

<u>Answer:</u> The concentration of copper fluoride in the solution is $4.90\times 10^{-3}mol/L$

<u>Explanation:</u>

To calculate the molarity of solute, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

We are given:

Given mass of copper (II) fluoride = 0.0498 g

Molar mass of copper (II) fluoride = 101.54 g/mol

Volume of solution = 100.0 mL

Putting values in above equation, we get:

$\text{Molarity of copper (II) fluoride)=\frac{0.0498\times 1000}{101.54\times 100.0}\\\\\text{Molarity of copper (II) fluoride}=4.90\times 10^{-3}mol/L$

Hence, the concentration of copper fluoride in the solution is $4.90\times 10^{-3}mol/L$

4 0

3 years ago

Identify the missing information for each atom or ion. Note that the atoms and ions are not necessarily neutral.

zimovet [89]

Answer:

Number of neutrons: 44

Number of protons: 34

Number of electrons: 36

Explanation:

The atomic number of Se (Selenium) is 34

Mass number is 78

Number of neutrons = mass number - atomic number = 78 - 34 = 44

Number of protons is the same as the atomic number

Number of protons = 34

Selenium ion has a charge of -2. This means it accepts two more electrons

Number of electrons = atomic number + 2 = 34 + 2 = 36

5 0

4 years ago

When a candle is lit and allowed to burn for 15 minutes, some wax drips and collects at the base of the candle, and the candle b

stellarik [79]

Answer:

The missing section of the candle burns away and evaporates while some drips and collects at the base.

Explanation:

This is because a chemical reaction is occurring due to the heat, causing the molecule in the candles wax to move around faster and faster therefore causing melting.

8 0

4 years ago

copper (1) oxide Cu2O is reduced to metallic copper by heating in a stream of hydrogen gas. what mass of water is produced when

dusya [7]

Answer:
1.41 g of H₂O

Solution:
The equation for given reaction is as follow,

Cu₂O + H₂ → 2 Cu + H₂O

According to equation,

127 g (2 mole) Cu is produced along with = 18 g (1 mole) of H₂O
So,
10 g Cu produced will generate = X g of H₂O

Solving for X,
X = (18 g × 10 g) ÷ 127 g

X = 1.41 g of H₂O

4 0

3 years ago