How many nitrogen atoms are in the chemical
formula below?
5C8H10N402

Answers

Answer 1

Answer:

There are 20 nitrogen atoms in the chemical formula mentioned.

What is chemical formula?

Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.They are used to describe the chemical reactions.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Answer 2

Answer:

Answer:

4 ATOME nitrogen in the formula

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When 2 mol of Fe(s) reacts with Cl2(g) to form FeCl3(s) according to this equation, 799 kJ of energy is evolved. Calculate ΔrHo. A) -399.5 kJ mol^-1 B) -199.75 kJ mol^-1 C) 399.5 kJ mol^-1 D) 199.75 kJ mol^-1

Answers

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Which of the following is not an acid? HCl

H2SO4

HNO3

NaOH

Answers

NaOH is not an acid. It is categorized as a base, specifically a strong base, since it has the capability to accept protons from any proton donor and, when it is in aqueous form, it fully dissociates into ions of sodium and hydroxide.

Any substance that tastes unpleasant in water solution, turns blue litmus paper red, reacts with some metals to release hydrogen, combines with bases to create salts, and stimulates chemical processes is considered an acid. Here among the given options, NaOH is a base. The correct option is D.

Any hydrogen-containing material that has the ability to donate a proton (hydrogen ion) to another chemical is considered an acid. A base is a molecule or ion that can take up an acid's hydrogen ion. Typically, sour tastes help to identify acidic chemicals.

An acid is not NaOH. It is categorized as a base, more specifically a strong base, because it can receive protons from any proton donor and completely dissociates into sodium and hydroxide ions in an aqueous form.

Thus the correct option is D.

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Which physical method can separate a mixture of steel ball bearings and marbles ?a. boiling
b. evaporation
c. filtration
d.sorting

Answers

SORTING METHOD can easily be used to separate a mixture of steel ball bearing and marbles. This separation method is suitable because the two substances that are mixed together have big sizes, so it is easy to separate the two by hand picking the particles. Sorting method is usually used as a separation technique when the size of the mixture is big and the mixed substances are in the same state.

Answer:

D. Sorting

Explanation:

Just tested

3.Write the symbol of the element that has a charge of +1 when it has 71 electrons.

Answers

The symbol : $\tt _(72)^(178)Hf^(+1)$

Further explanation

There are two components that accompany an element, the mass number and atomic number

Atoms are composed of 3 types of basic particles (subatomic particles): protons, electrons, and neutrons

The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.

Atomic number = number of protons = number of electrons ⇒ neutral number

Atomic mass is the sum of protons and neutrons

Atomic Number (Z) = Atomic mass (A) - Number of Neutrons

The element has 71 electrons and a charge of +1 , so

Number of protons = 71 + 1 = 72

Number of protons = the atomic number = 72

The element with atomic number 72 is Hafnium(Hf)

The atomic mass of Hf = 178 g/mol

The atom in a sample of an element must contain nuclei with the same number of?

Answers

Hey there!

Answer: Protons

The atom in a sample of an element must contain nuclei with the same number of protons. If the protons change in number, then the element will modify as well.

Thank you!

What does the pH of a solution have to be in order to be a base?