Ask question

Ask question

All categories

3 years ago

11

Which the following countries founded their first permanent settlement in North America: England, the Netherlands,France,and Spa

in

1 answer:

butalik [34]3 years ago

8 0

England with the Jamestown colony

You might be interested in

Can you please help me with this stoichiometry problem?

VMariaS [17]

Ah, stoichiometry. Have you ever done ratios before?

When you are given chemical reactions, all of the moles of reactant and product are proportional. This means that they're in ratio. Say we double the number of moles of water to 12 moles. How many moles do you think C2H6 will have? It'd be 4 moles, since just like water it was doubled since they're in proportion.

You can also think about that example above like a literal ratio. Since the original ratio is 2:6, it then turns into n:12, with n being the unknown number of moles of C2H6. Since ratios we know that ratios are always equal can be converted to fraction:

2/6 = n/12
Cross multiply:
24 = 6n
n = 4 moles

Makes sense? On to the actual question.

We're looking at the proportion between oxygen and carbon dioxide. Let's write that into a ratio:

7:4

Since there are seven moles of oxygen and four moles of carbon dioxide.

The number of moles of carbon dioxide is reduced to 1 mole. You could simply divide seven by 4 to find your answer (Since 4 was divided by 4 to make 1), but let's use the ratio method just in case questions in the future aren't this convenient:

7:4 becomes n:1

Convert to fraction:
7/4 = n/1

Cross multiply;
7 = 4n

Divide:
n = 7/4

Convert to decimal:
n = 1.75

The answer is Option C, 1.75 moles.

Let me know if you want me to explain anything I did here.
Good luck!
-T.B.

7 0

4 years ago

What is the molar mass of NH4Cl

adoni [48]

53.491 g/mol

Hope it helps. :)

6 0

3 years ago

Balance the following redox reaction in basic solution. Cl â’ (aq) + MnO â’ 4 (aq) â†’ Cl 2 (g) + MnO 2 (s)

FinnZ [79.3K]

$6\; \text{Cl}^{-} \; (aq) + 2\; \text{MnO}_4^{-} \; (aq) + 4 \; \text{H}_2 \text{O} \; (l) \to 3\; \text{Cl}_2 \; (g) + 2\; \text{MnO}_2 \; (s) + 8\; \text{OH}^{-} \; (aq)$

<h3>Explanation</h3>

The oxidation state of the manganese atom $\text{Mn}$ changes from +7 as in $\text{MnO}_4^{-}$ to +4 as in $\text{MnO}_2$ .
There are one $\text{Mn}$ atom in each $\text{MnO}_4$ ion.
Reducing each $\text{MnO}_4^{-}$ ion would thus consume three electrons.

Similarly, the oxidation state of the chlorine atom $\text{Cl}$ changes from -1 as in $\text{Cl}^{-}$ to 0 as in $\text{Cl}_2$ .
It takes two $\text{Cl}^{-}$ ions to produce one $\text{Cl}_2$ molecule.
Oxidizing every two $\text{Cl}^{-}$ would thus produce one $\text{Cl}_2$ while releasing two electrons.

Three $\text{Cl}_2$ molecules contain six chlorine atoms. Three $\text{Cl}_2$ would thus correspond to six $\text{Cl}^{-}$ ions.

Combining six $\text{Cl}^{-}$ , two $\text{MnO}_4^{-}$ ions, three $\text{Cl}_2$ ions, and two $\text{MnO}_2$ would balance the changes in oxidation state.

$6\; \text{Cl}^{-} \; (aq) + 2\; \text{MnO}_4^{-} \; (aq) \to 3\; \text{Cl}_2 \; (g) + 2\; \text{MnO}_2 \; (s)$ (NOT BALANCED)

Still, the product side lacks four oxygen atoms.

In an acidic environment, oxygen atoms would combine with protons to produce water.
In a basic environment (like this one,) there are nearly no protons for oxygen atoms to combine with. Oxygen atoms will likely combine with water to produce hydroxide ions.

Each oxygen atom combine with a water molecule to produce two hydroxide ions. Adding four water molecules and eight hydroxide ions would balance the equation.

5 0

3 years ago

What is a reliable measurement

gavmur [86]

A dependible common measurement

3 0

3 years ago

Read 2 more answers

If you cannot get a chair to move across the floor, it is because ___ friction opposes your push.

antiseptic1488 [7]

If you cannot get a chair to move across the floor, it is because STATIC friction opposes your push.

3 0

4 years ago

Read 2 more answers