All categories

3 years ago

Which statement about atoms and molecules is

Chemistry

2 answers:

Pavel [41]3 years ago

8 0

Elements always exist as pair of atoms called molecules .

Explanation:-

The material which has only one types of similar atoms called element .
Ex:-Sodium,Carbon etc

zhuklara [117]3 years ago

3 0

Answer:

Elements always exists as pairs of atoms called molecules

Explanation:

Elements are simply substances in its pure form.
The atom of an element is simply referring to a single element. eg we have sodium atom as Na, it appears singly and in its pure form
A molecule then refers to when an atom of the same element is paired up. i.e not in a single state. eg, we have one atom of hydrogen molecule as H2, Oxygen molecule as O2.
Note. the molecular elements appear in pairs while the atomic elements appear singly.

You might be interested in

How many valence electrons does lithium (Li) have available for bonding?

Marina CMI [18]

Lithium has 1 valence electron available for bonding. So its A.

6 0

3 years ago

Read 2 more answers

What is the length of a rectangle with width 10 in. and area 45 in.2

asambeis [7]

Possible answer could be 900 or 450.

6 0

3 years ago

The Statue of Liberty is composed of copper. The smallest particle of any amount of copper is A) an atom. B) an element. C) a co

Lina20 [59]

an atom because its the smallest thing in the entire world and in all orgnaisms

5 0

2 years ago

What is the correct measure of density

Darya [45]

Dividing the mass by the volume.

4 0

3 years ago

Read 2 more answers

Ammonia (NH3) is one of the most common chemicals produced in the united states. it is used to make fertilizer and other product

Greeley [361]

Answer:

a) N2 is the limiting reactant

b) 1215.9 grams NH3

c) 2283.6 grams H2

Explanation:

Step 1: Data given

Mass of N2 = 1000 grams

Molar mass N2 = 28 g/mol

Mass of H2 = 2500 grams

Molar mass H2 = 2.02 g/mol

Step 2: The balanced equation

N2(g) +3H2(g) → 2NH3(g)

Step 3: Calculate moles N2

Moles N2 = mass N2 / molar mass N2

Moles N2 = 1000 grams / 28.0 g/mol

Moles N2 = 35.7 moles

Step 4: Calculate moles H2

Moles H2 = 2500 grams / 2.02 g/mol

Moles H2 = 1237.6 moles

Step 5: Calculate limiting reactant

For 1 mol N2 we need 3 moles H2 to produce 2 moles NH3

N2 is the limiting reactant. There will be consumed 35.7 moles.

H2 is in excess. There will react 3*35.7 = 107.1 moles

There will remain 1237.6 - 107.1= 1130.5 moles H2

This is 1130.5 * 2.2 = 2283.6 grams H2

Step 6: Calculate moles NH3

For 1 mol N2 we need 3 moles H2 to produce 2 moles NH3

For 35.7 moles N2 we'll have 2*35.7 = 71.4 moles NH3

Step 7: Calculate mass NH3

Mass NH3 = moles NH3 * molar mass NH3

Mass NH3 = 71.4 moles * 17.03 g/mol

Mass NH3 = 1215.9 grams NH3

7 0

3 years ago