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dezoksy [38]
3 years ago
8

The table compares some characteristics of two atoms.

Chemistry
2 answers:
11Alexandr11 [23.1K]3 years ago
5 0

Answer:

Atoms X and Atom Y are isotope is right answer

Tanya [424]3 years ago
3 0

Answer: Option (c) is the correct answer.

Explanation:

As it is known that mass number means the sum of total number of protons and neutrons present in an atom.

Whereas atomic number means only total number of protons.

As it is given that mass number of element X is 7 and neutrons present in it are 4. Hence, its atomic number will be calculated as follows.

                 Atomic number = Mass number - no. of neutrons

                                            = 7 - 4

                                            = 3

Now, it is given that mass number of element Y is 9 and neutrons present in it are 5. Hence, its atomic number will be calculated as follows.

                 Atomic number = Mass number - no. of neutrons

                                            = 9 - 5

                                            = 4

Therefore, atomic number of element X is 3 and atomic number of element Y is 4. So, it means both these elements are present in same period.

Thus, we can conclude that it is true about the two atoms that atom X and Atom Y are in the same row on the periodic table.  

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Which of the following is NOT a property of bases? Which of the following is NOT a property of bases? Bases dissolve many metals
Hitman42 [59]

Bases dissolve many metals.

8 0
2 years ago
Calcium is a group 2 element. Chlorine is a group 7 element. They form an ionic compound called
kondaur [170]

Answer:

CaCl2

Explanation:

For every calcium there's 2 chlorine

7 0
2 years ago
What are two ways in which you can increase the potential energy of a marble on ramp
zlopas [31]

Answer:

You can make the ramp really steep and hold the marble at the top of it

Explanation:

6 0
2 years ago
The reaction of hydrogen gas and iron oxide is described by the chemical equation below. 3H2+Fe2O3→2Fe+3H2O How many moles of ir
ELEN [110]

Answer:

2.2 moles of Fe will be produced

Explanation:

Step 1: Data given

Number of moles of hydrogen gas = 3.3 moles

Number of moles of iron oxide = 1.5 moles

Step 2: The balanced equation

3H2 + Fe2O3 → 2Fe + 3H2O

Step 3: Calculate the limiting reactant

For 3 moles H2 we need 1 mol Fe2O3 to produce 2 moles Fe and 3 moles H2O

Hydrogen gas is the limiting reactant. It will completely be consumed (3.3 moles). Fe2O3 is in excess. There will react 3.3 / 3 = 1.1 moles

There will remain 1.5 - 1.1 = 0.4 moles Fe2O3

Step 4: Calculate moles Fe

For 3 moles H2 we need 1 mol Fe2O3 to produce 2 moles Fe and 3 moles H2O

For 3.3 moles H2 we'll have 2/3 * 3.3 = 2.2 moles Fe

2.2 moles of Fe will be produced

5 0
3 years ago
Nitrogen gas (112 g) reacts with hydrogen gas to produce 40.8 g of ammonia according to the following
Lemur [1.5K]

Answer:

%yield of NH₃ = 30%

Explanation:

Actual yield of NH₃ = 40.8g

Theoretical yield = ?

Equation of reaction

N₂ + 3H₂ → 2NH₃

Molar mass of NH₃ = 17g/mol

Molarmass of N = 14.00

2 molecules of N = 2 * 14.00 = 28g/mol

Number of moles = mass / molar mass

Mass = number of moles * molar mass

Mass = 1 * 28.00 = 28g of N₂ (the number of moles of N₂ from the equation is 1).

From the equation of reaction,

28g of N₂ produce (2 * 17)g of NH₃

28g of N₂ = 34g of NH₃

112g of N₂ = x g of NH₃

X = (112 * 34) / 28

X = 136g of NH₃

Theoretical yield = 136g of NH₃

% yield = (actual yield / theoretical yield) * 100

% yield = (40.8 / 136) * 100

% yield = 0.3 * 100

% yield = 30%

8 0
3 years ago
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