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3 years ago

Select the correct coefficients to balance the reaction given below. Al + _O₂ → ____ Al₂ O₃

Chemistry

1 answer:

Gnesinka [82]3 years ago

6 0

Answer:

4Al+3O2→2Al2O3

Explanation:

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A gas at STP occupies 22.4 L if the temperature is changed to 260 K and the pressures changed it to 0.50 ATM what will the new v

asambeis [7]

Answer:

The new volume will be 42, 7 L.

Explanation:

We use the gas formula, which results from the combination of the Boyle, Charles and Gay-Lussac laws. According to which at a constant mass, temperature, pressure and volume vary, keeping constant PV / T. The conditions STP are: 1 atm of pressure and 273 K of temperature.

P1xV1/T1 =P2xV2/T2

1 atmx 22,4 L/273K = 0,5atmx V2/260K

V2=((1 atmx 22,4 L/273K )x 260K)/0,5 atm= 42, 67L

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3 years ago

How many moles would there be in 500,000,000,000 atoms of silver? Show your calculation

muminat

Answer: 3.01 * 10^35

Explanation:

500,000,000,000 * 6.02 * 10^23

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3 years ago

Which statement best describes the building?

Kamila [148]

Answer:

the answer is A

Explanation:

because abiotic things are non-living things

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3 years ago

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The blood cells that directly attack germs are: *

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How many grams of lead(II) sulfate (303 g/mol) are needed to react with sodium chromate (162 g/mol) in order to produce 0.162 kg

Afina-wow [57]

Answer : The mass of $PbSO_4$ needed are, 1.515 grams.

Explanation :

First we have to calculate the mole of $PbCrO_4$ .

$\text{Moles of }PbCrO_4=\frac{\text{Mass of }PbCrO_4}{\text{Molar mass of }PbCrO_4}=\frac{0.162g}{323g/mole}=0.005mole$

Now we have to calculate the moles of $PbSO_4$ .

The balanced chemical reaction will be,

$PbSO_4+Na_2CrO_4\rightarrow PbCrO_4+Na_2SO_4[tex]From the balanced chemical reaction, we conclude thatAs, 1 mole of [tex]PbCrO_4$ produced from 1 mole of $PbSO_4$

So, 0.005 mole of $PbCrO_4$ produced from 0.005 mole of $PbSO_4$

Now we have to calculate the mass of $PbSO_4$

$\text{Mass of }PbSO_4=\text{Moles of }PbSO_4\times \text{Molar mass of }PbSO_4$

$\text{Mass of }PbSO_4=0.005mole\times 303g/mole=1.515g$

Therefore, the mass of $PbSO_4$ needed are, 1.515 grams.

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3 years ago

Select the correct coefficients to balance the reaction given below. __Al + ___O₂ → ____ Al₂ O₃

Select the correct coefficients to balance the reaction given below. Al + _O₂ → ____ Al₂ O₃