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victus00 [196]
3 years ago
9

Help please thank you so much ❤️

Chemistry
1 answer:
mart [117]3 years ago
6 0

Answer:

a)0.326

because pb's atomic mass is 207

mol = mass ÷ atomic mass

mol = 67.5 ÷ 207

mol = 0.326...

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Which is the limiting reactant if we start with 30.0 g Al and 30.0 h O2​
lorasvet [3.4K]

Al

Explanation:

The limiting reactant will be Al:

        4Al + 3O₂ → 2Al₂O₃

The limiting reactant is the reactant in short supply in a chemical reaction.

     Given parameters:

  Mass of Al = 30g  Molar mass = 27g/mol

         Number of moles = \frac{mass}{molar mass} =  \frac{30}{27}

         Number of moles of Al = 1.111 mole

  Mass of O₂ = 30g, molar mass = 32g/mol

   Number of moles =  \frac{30}{32} = 0.94mol

In the reaction:

          4 moles of Al reacted with 3 moles of O₂

         1.11moles of Al will require \frac{1.11 x3}{4} = 0.83mole to react

But we have been given 0.94mole of O₂. This is more than required.

Therefore O₂ is in excess and Al is the limiting reactant.

Learn more:

Limiting reagents brainly.com/question/6078553

#learnwithBrainly

4 0
2 years ago
In which state of matter are water molecules measured as having a comparatively high temperature?
skelet666 [1.2K]

Answer:

water vapor

because solid ice is a matter

5 0
3 years ago
What is the rate of acceleration of a 2,000-kilogram truck if a force of 4,200n is used to make it start moving forward?
butalik [34]

Answer:

The answer to your question is:      a = 2.1 m/s²

Explanation:

Data

Acceleration : ?

Mass = 2000 kg

Force = 4200 N

Formula

Newton's second law of motion    F = ma

                                                        a = F / m

Substitution

                                     a = 4200 N / 2000 kg

                                      a = 2.1 m/s²

                                                     

7 0
3 years ago
How many moles 1 gram H2SO4
Alexandra [31]

Answer:

0.0102 mole

Explanation:

Use and solve proportions for these with x as the unknown value.

4 0
3 years ago
How is the caloric value of a food sample determined?
bixtya [17]
By multiplying the total amount in grams of a given food sample by energy values established by nutritionists for the particular food type i believe
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