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4 years ago

Balance the following equation in acidic conditions. Cr2+ + H2MoO4 --> Cr3+ Mo

1 answer:

8 0

To balance the equation, Hydrogen ion should be added to the left of the equation and water to the right of the equation as follows:

$H^{+} + Cr^{2+} + H_{2} Mo O_{4} ---\ \textgreater \ Cr^{3+} + Mo + H_{2} O$

Balancing the equation

$6 H^{+} + 6 Cr^{2+} + H_{2} Mo O_{4} ----\ \textgreater \ 6 Cr^{3+} + Mo + 4 H_{2} O$

It can be noted that: ions are balanced at 18+ on left hand side and 18+ on right and side just like all the other chemical elements.

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In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. This combustion r

Serjik [45]

Answer:

CH₃O

Step-by-step explanation:

1. Calculate the mass of each element

Mass of C = 1.45 mg CO₂ × (12.01 mg C/44.01 mg CO₂) = 0.3957 mg C

Mass of H = 0.89 mg H₂O × (2.016 mg H/18.02 mg H₂O) = 0.0996 mg H

Mass of O = Mass of compound - Mass of C - Mass of H = (1.55 – 0.3957 – 0.0996) mg = 1.055 mg

2. Calculate the moles of each element

Moles of C = 0.3957 mg C × 1mmol C/12.01 mg C = 0.03295 mol C

Moles of H = 0.0996 mg H × 1 mmol H/1.008 mg H = 0.0988 mol H

Moles of O = 1.055 mg O × 1 mmol O/ 16.00 mg O = 0.06592 mol O

3. Calculate the molar ratios

Divide all moles by the smallest number of moles.

C: 0.032 95/0.032 95 = 1

H: 0.0988/0.032 95 = 2.998

O: 0.065 92/0.032 95 = 2.001

4. Round the ratios to the nearest integer

C:H:O = 1:3:2

5. Write the empirical formula

The empirical formula is CH₃O.

4 0

4 years ago

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Greeley [361]

B, the height above or below sea level

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3 years ago

How many moles are in a 275g sample of K2CrO3

Marrrta [24]

Answer:

There are approximately 1.54 moles in a 275 g sample of $K_2CrO_3$ .

Explanation:

To find out number of moles, fistly we have to calculate molecular mass of $K_2CrO_3$ .

There are 2 atoms of Potassium 1 atom of Chromium and 3 atoms of oxygen in the given compound.

For molecular mass we have to add the value of mass of 2 atoms of Potassium with mass of 1 atom of Chromium and with mass of 3 atoms of oxygen.

Atomic mass of Potassium = 39

Atomic mass of Chromium = 52

Atomic mass of Oxygen = 16

Now,

Molecular mass of $K_2CrO_3$ = $2\times 39+52+3\times 16=78+52+48=178\ gm$

The molecular mass of a compound is the mass of compound in one mole.

To find out the number of moles, we have to divide given mass of compound by its molecular mass.

$Number\ of\ moles=\frac{given\ mass}{molecular\ mass}$

$Number\ of\ moles=\frac{275}{178}= 1.54$

Hence the number of moles in 275 gm of $K_2CrO_3$ is 1.54.

8 0

3 years ago

For sediment to be transformed into rock, which set of procces must take place?

Burka [1]

Answer:

compaction and cementation.

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3 years ago

How many valence electrons do elements in the same family as Aluminum contain?

Nady [450]

Aluminium family has 3 electrons in their valence shell....i hope its correct..｡◕‿◕｡

5 0

3 years ago