Chemistry, 14.04.2020 15:54 sethhdoty

Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation : 2 S(s) + 3 O2(g) + 4 NaOH(aq) → 2 Na2SO4(aq) + 2 H2O(l)

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Answer from: stevend0599

Sodium hydroxide NaOH will be the limiting reagent.

Explanation:

By stocheimetry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) you can see that the following amounts in moles of each compound react and are produced:

S: 2 molesO₂: 3 molesNaOH: 4 molesNa₂SO₄: 2 molesH₂O: 2 moles

On the other hand, you know the following masses of each element that make up the compounds:

S: 32 g/moleO: 16 g/moleNa: 23 g/moleH: 1 g/mole

Therefore, the molar mass of each compound is:

S: 32 g/moleO₂: 2* 16 g/mole= 32 g/moleNaOH: 23 g/mole+16 g/mole+ 1 g/mole= 40 g/moleNa₂SO₄: 2*23 g/mole + 32 g/mole + 4*16 g/mole= 142 g/moleH₂O: 2* 1 g/mole + 16 g/mole= 18 g/mole

Therefore, by stoichiometry of the reaction, the following amounts of the compounds react by mass or are produced:

S: 2 moles* 32 g/mole= 64 gO₂: 3 moles* 32 g/mole= 96 gNaOH: 4 moles* 40 g/mole= 160 gNa₂SO₄: 2 moles* 142 g/mole= 284 gH₂O: 2 moles* 18 g/mole= 36 g

Now, you apply a simple rule of three as follows: if 64 grams of S reacts with stoichiometry with 96 grams of O₂, 2 grams of S with how much mass of O₂ will react?

$mass of O_{2} =\frac{2 grams of S*96 grams of O_{2} }{64 grams of S}$

mass of O₂= 3 grams

You have enough amount of O₂ since it needs 3 grams and has 3 grams. The oxygen gas will not be the limiting reagent.

Now, you apply the following rule of three: if 64 grams of S reacts with stoichiometry with 160 grams of NaOH, 2 grams of S with how much mass of NaOH will react?

$mass of NaOH=\frac{2 grams of S*160 grams of NaOH }{64 grams of S}$

mass of NaOH= 5 grams

In this case you need 5 grams of NaOH, but it only has 4 grams. This indicates that you do not have enough, which means that sodium hydroxide will be the limiting reagent.

Answer from: Quest

c. because step up transformer steps up the input voltage i.e increases the input voltage

the number of turns are greater on the secondary side of step up transformer

transformer does not handle dc current

Answer from: Quest

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

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Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g...

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