Los átomos ni de crean ni se destruyen,durante una reacción química.Por lo tanto una ecuación química ha de tener el mismo numero de atomos de cada elemento a ambos lados de la flecha. Se dice entonces que la ecuación esta balanceada

Espero y te sirva!!

5 0

3 years ago

Quantum numbers arise naturally from the mathematics used to describe the possible states of an electron in an atom. The four qu

Nostrana [21]

Answer:

a), b), c) & f)

Explanation:

d) does not apply because Ms value can be either +½ or -½

e) does not apply because Ml - values range from -l to +l, hence l= 2 doesn't exist when l= 1

3 0

3 years ago

7. Citric acid contains 37.5 g C, 58.3 g 0, and 4.2 g H and the MW= 192, what is

MrRa [10]

Answer:

Explanation: sceintific calculator

7 0

3 years ago

I know that the answer is C. 8, but can you explain step by step how to get that answer?

Leya [2.2K]

Answer:

Explanation:

Oxidation:

$Fe^{2+} -->Fe^{3+}+e^{-}$

Reduction:

$Cr_{2}O_{7}^{2-}+6e^{-} -->2Cr^{3+}$

We have to equalise the number of moles of electrons gained and lost in a redox reaction in order to get a balanced reaction.

Hence we have to multiply the oxidation reaction throughout by 6.

and adding the two half-reactions we obtain:

$6Fe^{2+}+Cr_{2}O_{7}^{2-} -->6Fe^{3+}+2Cr^{3+}$

Still the total charge and number of oxygen is not balanced.

Since the reaction takes place in acidic conditions, we will add required number of H+ to the appropriate side to balance the charge and add half the amount of H2O to balance the hydrogen atoms.

We add 14 H+ on LHS and 7H2O on RHS to obtain:

$6Fe^{2+}+Cr_{2}O_{7}^{2-}+14H^{+} -->6Fe^{3+}+2Cr^{3+}+7H_{2}O$

Sum of coefficients of product cations = 6+2 = 8

4 0

3 years ago