All categories

4 years ago

Consider the compound Cu(NO3)2 and answer the following questions.

Chemistry

2 answers:

LenKa [72]4 years ago

6 0

The answer is 187.5 g of Cu (NO3)2.

First you must multiply the element's atomic mass by the amount of atoms within that compound.
-Here there is only one Cu atom, so you leave it's mass at 63.5g. (63.5g × 1)
-There are two molecules of NO3, so you multiply the atomic mass of Nitrogen (mass is 14.0g) by 2. (14.0g × 2)
-The case is not the same for Oxygen (O) because there are three oxygen atoms in the molecule of NO3,and there are two NO3. So you multiply Oxygen's atomic mass by 3 and by 2 (16.0g × 3 × 2)

Finally, you add the totals togther and get its molar mass.

Mrrafil [7]4 years ago

4 0

1) Name: copper(II) nitrate

2) molar mass:

Determine the mass of every element by multiplying its subscript by the atomic mass and add the masses of all the elements

Element atomic mass subscript total mass of the element
Cu 63.55 1 63.55
N 14.01 2 2*14.01 = 28.02
O 16.00 3*2=6 6*16.00 = 96.00

Molar mass = 63.55 + 28.02 + 96.00 = 187.57 g/mol

You might be interested in

A sample weighing 3.110 g is a mixture of Fe 2 O 3 (molar mass = 159.69 g/mol) and Al 2 O 3 (molar mass = 101.96 g/mol). When he

grandymaker [24]

Answer:

The mass fraction of ferric oxide in the original sample : $\frac{723}{3110}$

Explanation:

Mass of the mixture = 3.110 g

Mass of $Fe_2O_3=x$

Mass of $Al_2O_3=y$

After heating the mixture it allowed to react with hydrogen gas in which all the ferric oxide reacted to form metallic iron and water vapors where as aluminum oxide did not react.

$Fe_2O_3(s)+3H_2(g)\rightarrow 2Fe(s)+3H_2O(g)$

Mass of mixture left after all the ferric oxide has reacted = 2.387 g

Mass of mixture left after all the ferric oxide has reacted = y

$x=3.110 g- y=3.110 g - 2.387 g = 0.723 g$

The mass fraction of ferric oxide in the original sample :

$\frac{0.723 g}{3.110 g}=\frac{723}{3110}$

5 0

3 years ago

29.3g CO2 and 20.8g H2O

docker41 [41]

Answer:

the most best answer is 50.1 you never find such type of answer

6 0

3 years ago

In a colloid, solution, or suspension, particles are dispersed throughout the mixture. What is the order of these three types of

a_sh-v [17]

1) solution
2) colloid
3) suspension

4 0

4 years ago

Read 2 more answers

At rest, a neuron has a lower concentration of sodium than the surrounding fluid. The neuron also has a higher concentration of

pshichka [43]

Answer:

a. Remaining at rest requires the use of ATP.

Explanation:

The resting membrane potential is maintained by the sodium-potassium pump. The sodium potassium pump does this by actively pumping sodium ions out of the cell and potassium ions inside the cell in a ratio of 3:2. This movement of ions by the sodium-potassium pump is against their concentration gradient. In a neuron at rest, there are more sodium ions outside the cell than there are inside the cell. Also, there are are more potassium ions inside the cell than there are outside the cell. However, there are ion channels through which these ions enter and leave the cell. Sodium ion channels allow sodium to enter the cell following its concentration gradient, whereas, potassium ion channels allow potassium to leave the cell following its concentration gradient. However, more potassium ions leave the cell than do sodium ions enter the cell because of the higher permeability of the cell to potassium ions.

In order to maintain the resting membrane potential, the sodium potassium pump powered by the hydrolysis of an ATP molecules pumps sodium ions out of the cell and potassium ions into the cell.

<em>Therefore, the correct option is A, as ATP is needed by the sodium-potassium pump in order to maintain the resting membrane potential.</em>

6 0

3 years ago

Using the periodic table entry of iron below, match the numbers with what they represent.

evablogger [386]

Answer:

Answers:

1. The number 26 ↔ atomic number

2. The number 56 ↔ mass number

3. The number 4 ↔ the number of orbits

4. The number 30 ↔ number of neutrons.

5. The number 14 ↔ number of electrons in n = 3

6. The number 2 ↔ number of valence electrons.

Explanation:

The same relevant information to deal with the data reported can be found in many periodic tables.

Herewith, I copy the mentioned entry. Please see the image attached.

This is the explanation of the information shown in the entry:

1) Symbol: in the centre of the picture: Fe. It is the symbol of iron.

2) Superscript to the lef of the symbol: 26. It is the atomic number, i.e. the number of protons. Hence, this is the first match:

1. The number 26 ↔ atomic number

3) The number 55.845 below the symbol and name of the element is the atomic mass of the element.

The atomic mass is the avereage mass of the several isotopes of the same element that exist in nature.

The particles that count for the atomic mass are the neutrons and protons, and that is reason of the called mass number, which is the sum of the neutrons and protons of a particular isotope.

An atomic mass of 55.845 means that likely there exist isotopes with mass number 56. This is, with a total number of 56 nucleons (protons and neutrons).

Since, as explained above, Fe has 26 protons, you can calcualte the number of neutrons of the 56 mass number isotope as: n = 56 - 26 = 30 neutrons.

Hence, you can match these:

2. The number 56 ↔ mass number

4. The number 30 ↔ number of neutrons

5. The numbers 2, 8, 14, and 2, that appear in the upper right corner of the image are the number of electrons in the different main energy levels, which is the principal quantum number (n)

They mean:

energy level (n) number of electrons

1 2

2 8

3 14

4 2

Hence you can match this:

5. The number 14 ↔ number of electrons in n = 3

6. The number 2 ↔ number of valence electrons

The valence electrons are the electrons in the last main energy level (here n = 4).

3. The number 4 ↔ the number of orbits

Note: orbits is not a good name for the energy levels, since orbits implies fixed paths around the nucleus and that is an overcome model.

3 0

3 years ago

Read 2 more answers