A chemical equation is balanced by changing or adding

1 answer:

6 0

<span>A chemical equation is balanced by changing or adding C. numbers in front of molecules, which are called coefficients.
For example:
O2 + 2 H2 ---> 2 H2O (number 2 is added to both sides in order to balance the equation)</span>

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How many moles are in 35.5 g of aluminum?

Blizzard [7]

Answer:

1.316 moles of Aluminum

Explanation:

The molar mass for Al is 26.98 g/mol

$\frac{35.5g}{26.98g/mol} =1.316 moles Al$

3 0

3 years ago

Is it necessary to know the exact volume of the unknown acid or base to be titrated?

Darina [25.2K]

Yes, It is important to know the volume of Unknown acid or base to be titrated.

Titration is carried out in order to find out the concentration (i.e. molarity) of unknown acid or base. In this process a standard solution of acid or base is taken and is titrated with known volume of of titrant. At end point (neutralization) the amount of standard titrant utilized is calculated and following formula is employed to calculate the unknown concentration of unknown solution.

M₁V₁/n₁ = M₂V₂/n₂

7 0

3 years ago

Read 2 more answers

Which mineral can be easily scratched by a finger nail, has cleavage, a metallic luster and has a black streak? 11. Which two el

Kobotan [32]

Answer:

Galena

Explanation:

Galena is also known as lead glance. This is a natural mineral of the form lead(II) sulfide. It is one of the most important ore for lead. It is widely found and is mainly distributed in sulfide minerals.

Galena can be easily scratched by finger nails. It has black streak and have a metallic luster. Galena have cleavage. It usually occurs as cubic crystals.

3 0

3 years ago

Someone please help me??

Scrat [10]

The answer is 0.18

Because the equation for finding the molarity of a solution is:

Moles divided by Liter of solution,

so, you dissolve 0.32 mol of KCL in 1759 ml of Water 1759 ml is 1.759 liters when you plug the numbers in you get 0.18

Hope this helps,

kwrob

6 0

3 years ago

The reaction rate is k[Ce4+][Mn2+] for the following reaction: 2Ce4+(aq) + Tl+(aq) + Mn2+(aq) → 2Ce3+(aq) + Tl3+(aq) + Mn2+(aq W

sdas [7]

Answer:

Manganese (II) ion, Mn²⁺

Explanation:

Hello,

In this case, given the overall reaction:

$2Ce^{4+}(aq) + Tl^+(aq) + Mn^{2+}(aq) \rightarrow 2Ce^{3+}(aq) + Tl^{3+}(aq) + Mn^{2+}(aq)$

Thus, since manganese (II) ion, Mn²⁺ is both at the reactant and products, we infer it is catalyst, since catalysts are firstly consumed but finally regenerated once the reaction has gone to completion. Moreover, since inner steps are needed to obtain it, we can infer that the given rate law corresponds to the slowest step that is related with the initial collisions between Ce⁴⁺ and Mn²⁺

Best regards.

8 0

4 years ago