A valid lewis structure of __________ cannot be drawn without the central atom violating the octet rule. pf5 pcl3 so3 ccl4 co2

How many moles are in 8 grams of NaCl?

anygoal [31]

There are 2 moles in 8 grams

5 0

2 years ago

Which one of the following statements is not true concerning 2.00 L of a 0.100 M solution of Ca3(PO4)2?

Len [333]

Answer: The correct answer is Option B.

Explanation:

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

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$ .......(1)

For A:

Molarity of calcium phosphate solution = 0.100 M

Volume of solution = 2.00 L

Putting values in equation 1, we get:

$0.100M=\frac{\text{Moles of }Ca_3(PO_4)_2}{2.00}\\\\\text{Moles of }Ca_3(PO_4)_2=(0.100mol/L\times 2.00L)=0.200mol$

Moles of calcium phosphate = 0.200 moles

For B:

1 mole of calcium phosphate contains 3 moles of calcium atoms, 2 moles of phosphate atoms and 8 moles of oxygen atoms.

So, 0.200 moles of calcium phosphate will contain = $(8\times 0.200)=1.6$ moles of oxygen atoms.

Moles of oxygen atoms = 1.6 moles

For C:

Molarity of calcium phosphate solution = 0.100 M

Volume of solution = 1.00 L

Putting values in equation 1, we get:

$0.100M=\frac{\text{Moles of }Ca_3(PO_4)_2}{1.00}\\\\\text{Moles of }Ca_3(PO_4)_2=(0.100mol/L\times 1.00L)=0.100mol$

Moles of calcium ions = $(0.100\times 3)=0.300$ moles

For D:

Molarity of calcium phosphate solution = 0.100 M

Volume of solution = 5.00 L

Putting values in equation 1, we get:

$0.100M=\frac{\text{Moles of }Ca_3(PO_4)_2}{5.00}\\\\\text{Moles of }Ca_3(PO_4)_2=(0.100mol/L\times 5.00L)=0.500mol$

Moles of phosphorus atoms = $(0.500\times 2)=1.00$ moles

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of atoms

Number of phosphorus atoms in 0.500 moles of calcium phosphate will be = $(1.00\times 6.022\times 10^{23})=6.022\times 10^{23}$

For E:

1 mole of calcium phosphate contains 3 moles of calcium ions and 2 moles of phosphate ions.

So, 0.200 moles of calcium phosphate will contain = $(3\times 0.200)=0.600$ moles of calcium ions

Moles of calcium ions = 0.600 moles

Hence, the correct answer is Option B.

6 0

2 years ago

What observations and inferences can you make from this picture?

Salsk061 [2.6K]

I know they are fishing and there is an alligator in the lake. The alligator might grab the bait and attack the fishers.

Hope I helped!
Let me know if you need anything else!
~ Zoe

6 0

2 years ago

Read 2 more answers

Changes of state are a result of a change in the______of the matter.

jasenka [17]

Answer: -

Kinetic energy.

Explanation: -

Solids have the least kinetic energy and the highest intermolecular force of attraction among the three states of matter.

When heat energy is supplied to the solid, the kinetic energy of the solid particles increases. At some point, the kinetic energy becomes comparable to the intermolecular force of attraction. At that point solids change into liquids.

When further heat energy is given, at certain point the kinetic energy becomes far greater than the intermolecular forces of attraction. At that point it becomes gas.

4 0

3 years ago

State whether each of these statements is true or false. (a) a carbon–carbon triple bond is shorter than a carbon–carbon single

attashe74 [19]

Answer:

(a) a carbon–carbon triple bond is shorter than a carbon–carbon single bond.

The given statement is true.This because bond order in of (C-C) bond in triple bond is 3 whereas the bond order of (C-C) bond in single bond is 1. Higher the bond order shorter will be the bond length.

(b) There are exactly six bonding electrons in the oxygen molecule.

The given statement is false. This is because bond order present in oxygen molecule is 2 which means there are 4 bonding electrons in the oxygen molecule.

(c) the (C-O) bond in carbon monoxide is longer than the (C-O) bond in carbon dioxide.

The given statement is false.This because bond order in of (C-O) bond in CO is 3 whereas in $CO_2$ the bond order of (C-O) bond is 2. Higher the bond order shorter will be the bond length.

(d) The (O-O) bond in ozone is shorter than the (O-O) bond in oxygen.

The given statement is false. This is because bond order in of (O-O) bond in ozone molecule is 1.5 whereas in $O_2$ the bond order of (O-O) bond is 2. Higher the bond order shorter will be the bond length.

(e) The more electro-negative the atom, the more bonds it makes to other atoms.

The given statement is false. This is because atom with more electro-negative character. Since, they are highly electron rich atoms so they will tend to form less number of bonds with other atom.

8 0

2 years ago