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3 years ago

What explains the fact that no machine is 100 percent efficient?

1 answer:

3 0

Hello, to answer your question. It is because all machines require a fuel or source to power it making it imperfect for using some source that may not be renewable.

Signed by, Virtouso Sargedog

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In the second step of this reaction, isocyanic acid reacts to form melamine and carbon dioxide: HNCO(l)→C3N3(NH2)3(l)+CO2(g) Bal

kykrilka [37]

Answer:

The coefficients are 6, 1, 3

Explanation:

HNCO →C3N3(NH2)3 + CO2

From the above equation, there are a total of 6 atoms of nitrogen on the right side and 1atom on the left. It can be balance by putting 6 in front of HNCO as shown below:

6HNCO → C3N3(NH2)3 + CO2

Now there are 6 atoms of carbon on the left side and 4 atoms on the right side. It can be balance by putting 3 in front of CO2 as shown below:

6HNCO → C3N3(NH2)3 + 3CO2

Now the equation is balanced as the numbers of atoms of the different elements on both sides of the equation are the same.

The coefficients are 6, 1, 3

8 0

2 years ago

A typical person has an average heart rate of 75.0 beat in minutes calculate the given question how many beats does she have in

Semenov [28]

in 6.0 years it will be 450.00 heart beats

in 6.00 years it will be 450.000 heart beats

in 6.000 years it will be 450.0000 heart beats

Explanation:

3 0

2 years ago

12.8^2<br><img src="https://tex.z-dn.net/?f=%20%7B12.8%7D%5E%7B2%7D%20" id="TexFormula1" title=" {12.8}^{2} " alt=" {12.8}^{2} "

Alekssandra [29.7K]

163.84 is the answer!

8 0

2 years ago

before phase change: molecules move around each other 15. The medicine in the diagram above has molecules that are moving around

Likurg_2 [28]

Answer:

89 pills

Explanation:

because it is

8 0

2 years ago

Calculate the molality of 25.0 grams of potassium bromide dissolved in 900 mL of pure water. (density of pure water is 1.0 g/mL)

Orlov [11]

Answer:

0.23mol/kg

Explanation:

Given parameters:

Mass of Potassium Bromide = 25g

Volume of pure water = 900mL

Unknown:

Molality = ?

Solution:

Molality is one of the ways of measuring concentration. It is the number of moles of solute in given mass of solvent.

Mathematically;

Molality = $\frac{number of moles }{mass of solvent}$

Number of moles of KBr;

Number of moles = $\frac{mass}{molar mass}$

Molar mass of KBr = 39 + 80 = 119g/mol

Number of moles = $\frac{25}{119}$ = 0.21mole

Mass of solvent;

Mass of solvent = density of water x volume of water

Mass of solvent = 1.0g/mL x 900mL = 900g = 0.9kg

Now;

Molality = $\frac{0.21}{0.9}$ = 0.23mol/kg

8 0

2 years ago