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Mariana [72]
4 years ago
14

The world's tallest artificial Christmas tree measured a mammoth 5.20 x 103 cm. How tall is the tree in kilometers?​

Chemistry
1 answer:
Vlad [161]4 years ago
8 0

Answer:

0.005356

Explanation:

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A coal-burning power plant produces 500 megawatts of electricity while burning 225,000 kg of coal per hour (almost 250 tons each
kolbaska11 [484]

Answer:

40%

Explanation:

The efficiency of a plant is determined by

eff=\frac{E_{produced}}{E_{in}}

Our produced energy is

500 \ MW

While the input energy can be calculated

E_{in}=number\ of \ coal \ in \ * energy\ per\ coal\ unit\\ =\frac{225000}{3600}coal/ s\ *20\ MJ/coal\\ = 1250\ MW

So, the efficiency of plant is

eff=\frac{500}{1250}}\\ 0.4

or 40% efficient

6 0
3 years ago
A solution is made containing 4.92 g of sodium lithium chloride per 347 g of water.
Margaret [11]

% mass of a solution is the mass of the solute present per 100 g of solution. It can be calculated using the formula,

Mass % = \frac{Mass of solute (g)}{Mass of solution (g)} * 100

Mass of solute = 4.92 g

Mass of solvent, water = 347 g

Total mass of solution = 347 g + 4.92 g = 351.92 g

Mass % of the solute = \frac{4.92 g}{351.92 g} * 100 = 1.398 %

Therefore, the weight/weight % = 1.398 %

7 0
3 years ago
Leslie incorrectly balances an equation as 2C4H10 + 12O2 → 8CO2 + 10H2O.
gregori [183]
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An engineer that designs buildings is a(n) _____.
My name is Ann [436]

Answer: It's a civil engineer

Explanation:

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4 years ago
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List the factor on which Ka of a weak acid depends​
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I don’t know this, so I did research, so here! This is from a website called “Quora”, btw!
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3 years ago
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