Abbreviation for mole

You have 0.14 moles of sodium chloride (NaCl). How many grams do you have? ( 1 mole of NaCl = 58 grams NaCl) *

Step2247 [10]

Answer:

Option D is correct = 8.12 grams of NaCl

Explanation:

Given data:

Moles of sodium chloride = 0.14 mol

Mass of sodium chloride = ?

Solution:

Formula:

Number of moles = mass of NaCl / Molar mass of NaCl

Molar mass of NaCl = 58 g/mol

Now we will put the values in formula.

0.14 mol = Mass of NaCl / 58 g/mol

Mass of NaCl = 0.14 mol × 58 g/mol

Mass of NaCl = 8.12 g of NaCl

Thus, 0.14 moles of NaCl contain 8.12 g of NaCl.

4 0

3 years ago

The invisible spectrum contains all the colors of the rainbow.<br> A.)True<br> B.)False

frosja888 [35]

Answer:

False

Explanation:

We can see the colors of the rainbow, therefore they are visible.

3 0

2 years ago

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Classify these properties of the metal lithium as physical or chemical. Physical Chemical light enough to float on water silvery

ra1l [238]

The psychical properties do no change the composition of the lithium metal.

The chemical properties will change the composition of the lithium producing other substances.

light enough to float on water - physical property

silvery gray in color - physical property

changes from silvery gray to black when placed in moist air - chemical property

(in air the lithium will react with the oxygen forming the oxide which have a black color)

can be cut with a sharp knife - physical property

in the liquid state, it boils at 1317 °C - physical property

reacts violently with chlorine to form a white solid - chemical property

in the liquid state, it reacts spontaneously with its glass container, producing a hole in the container - chemical property

burns in oxygen with a bright red flame - chemical property

4 0

3 years ago

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During an experiment, a canister filled with hot water was added to a beaker filled with cold water. In which direction did the

Nady [450]

Answer:

A)

Explanation:

Heat moves from where it's hot, to where it's not

3 0

2 years ago

A compound is found to contain 30.45 % nitrogen and 69.55 % oxygen by mass. To answer the question, enter the elements in the or

butalik [34]

Answer: The molecular formula of the compound is $NO_2$

Explanation:

Converting all these percentages into mass.

We take the total mass of the compound to be 100 grams, so, the percentages given for each element becomes its mass.So, the mass of each element is equal to the percentage given.

Mass of N = 30.45 g

Mass of O = 69.55 g

Step 1 : convert given masses into moles.

Moles of N= $\frac{\text{ given mass of N}}{\text{ molar mass of N}}= \frac{30.45g}{14g/mole}=2.175moles$

Moles of O = $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{69.55g}{16g/mole}=4.347moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For N = $\frac{2.175}{2.175}=1$

For O = $\frac{4.347}{2.175}=2$

The ratio of N: O = 1: 2

Hence the empirical formula is $NO_2$ .

Empirical mass of $NO_2$ is = 14(1)+16 (2)=46

The equation used to calculate the valency is:

$n=\frac{\text{molecular mass}}{\text{empirical mass}}=\frac{46.01}{46}=1$

Step 3: To calculate the molecular formula= $n\times {\text {Equivalent Formula}}=1\times NO_2=NO_2$

Hence, the molecular formula of the compound is $NO_2$

5 0

3 years ago