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jasenka [17]
3 years ago
12

Which of the following describes a perpetual-motion machine?

Chemistry
2 answers:
makkiz [27]3 years ago
5 0

Answer:

a motor that requires no energy input once it is running

Mashutka [201]3 years ago
4 0

Answer:

c

Explanation:

a p e x :)

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Ivanshal [37]

Explanation:

the answer is true because I had this question and got it right

3 0
2 years ago
37.5g of nitrogen reacts with 15.5 g of hydrogen. What mass of ammonia can be made? What is the limiting reactant?
Gennadij [26K]

Answer:

Limiting reactants or limiting reagents decide the amount of product formed and the amount of excess reagent used.

7 0
3 years ago
Please help with q2
Marta_Voda [28]
A. It is counterproductive
B. Vinegar
C. Ammonia

Please give me Brainliest
7 0
2 years ago
Read 2 more answers
Consider the following unbalanced reaction: P4(s) + F2(g) → PF3(g) What mass of fluorine gas is needed to produce 120. g of PF3
Studentka2010 [4]

Answer:

44.28 grams.

Explanation:

Let us write the balanced reaction:

P_{4}+6F_{2}-->4PF_{3}

As per balanced equation, six moles of fluorine gas will give four moles of PF₃.

The mass of PF₃ required = 120 g

The molar mass of PF₃ = 88g/mol

Moles of PF₃ required =\frac{mass}{molarmass}=\frac{120}{88}=1.364mol

The moles of fluorine gas required = \frac{4X1.364}{6}=0.91

the mass of fluorine gas required = moles X molar mass = 0.91x38 = 34.58g

Now this much mass will be required if the reaction is of 100% yield

But as given that the yield of reaction is only 78.1%

The mass of fluorine required = \frac{massX100}{78.1} =\frac{34.58X100}{78.1} =44.28g

4 0
3 years ago
The overall cell reaction occurring in an alkaline battery isZn(s) + MnO₂(s) + H₂O(l) → ZnO(s) + Mn(OH)₂(s) (b) If 4.50 g of zin
Airida [17]

5.911 grams of manganese dioxide and 1.224 gram of water are consumed.

<h3>What is Balanced Chemical Equation ?</h3>

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

The given reaction balanced equation is:

Zn(s) + MnO₂(s) + H₂O(l) → ZnO(s) + Mn(OH)₂(s)

<h3>How to find the number of moles ?</h3>

To find the number of moles use the expression:

Number of moles = \frac{\text{Given mass}}{\text{Molar mass}}

Here,

Mass of Zn = 4.50 g

Molar mass of Zn = 65.4 g/mol

Now put the value in above expression

Number of moles of Zn = \frac{\text{Given mass}}{\text{Molar mass}}

                                       = \frac{4.5\ g}{65.4\ \text{g/mol}}

                                       = 0.068 mol

Mass of MnO₂ = Moles of MnO₂ × Molar mass of MnO₂

                        = 0.068 mol × 86.9368 g/mol

                         = 5.911 g

Mass of H₂O = Moles of H₂O × Molar mass of H₂O

                     = 0.068 mol × 18.0 g/mol

                     = 1.224 g

Thus from the above conclusion we can say that 5.911 grams of manganese dioxide and 1.224 gram of water are consumed.

                 

Learn more about the Balanced chemical equation here: brainly.com/question/26694427

#SPJ4

4 0
1 year ago
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