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3 years ago

When 1.82 mole of HCL reacts with excess MnO2, how many moles of Cl2 form?

1 answer:

6 0

The balanced reaction is:

MnO2<span>(s) + 4HCl(aq) → Cl2(g) + MnCl2(aq) + 2H2O(l)
</span>
We are given the amount of hydrochloric acid to be used for the reaction. This will be the starting point for the calculations.

1.82 mol HCl ( 1 mol Cl2 / 4 mol HCl) = 0.46 mol Cl2

Therefore, 0.46 mol of chlorine gas is produced for the reaction of hydrochloric acid and manganese oxide.

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Sugar is easily soluble in water and has a molar mass of 342.30 g/mol. What is the molar concentration of a 259.8 mL aqueous sol

DanielleElmas [232]

Answer:

$M=0.822M$

Explanation:

Hello,

In this case, given the mathematical definition of molar concentration as the moles of solute divided by the liters of solution:

$M=\frac{n}{V}$

We can easily compute it by firstly computing the moles of sugar by using its molar mass:

$n=73.1g*\frac{1mol}{342.30g} =0.214mol$

After that, we compute the concentration by realizing 259.8 mL equals 0.2598 L:

$M=\frac{0.214mol}{0.2598L}\\ \\M=0.822mol/L$

Or just:

$M=0.822M$

Considering molar units as mol/L

Best regards.

5 0

3 years ago

Explain how elements are arranged on the periodic table. What does the table tell you when you read it like sentences in a book

DochEvi [55]

Explanation:

In periodic table:

Elements are arranged according to their atomic number in increasing order.
When we move left to right we move along a period.The period in the periodic table tell us about the principal quantum number,(n).
When move from top to bottom we are moving in group. The group in the periodic table tell us about the number of the valence electrons present in the valence shell of the elements of the particular group.

3 0

3 years ago

Read 2 more answers

14. Which group of diamagnetic transition metals exhibits trends in density and melting points that don't match the same trends

inn [45]

Answer:

Group 12

Explanation:

Group 12 transition metals are diamagnetic. They behave properties that distinguish them. They naturally have twelve electrons hence their outermost shell is fully filled.

Transition metals have high densities which increases down the group. However, the increase in density of transition elements of group 12 varies with temperature at a rate that is quite different from other transition elements. Hence the differences in the value of melting points and density changes by only a very small amount as you come down group 12 compared to other groups of transition elements.

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3 years ago

How many atoms of hydrogen are in 4Ca(OH)2

inn [45]

Explanation:

there are 8 atoms of hydrogen

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2 years ago

Which set of elements has the MOST similar physical and chemical properties?

Nana76 [90]

A k ca sf obviously

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3 years ago