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3 years ago

10. The significant figures in a measurement

Chemistry

2 answers:

bazaltina [42]3 years ago

8 0

Im pretty sure its D. I would wait for others though.

dedylja [7]3 years ago

5 0

Answer:

I think D as well

Explanation:

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Answer:

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2 years ago

What elements are found in potassium oxide

GaryK [48]

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3 years ago

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What is the pH of a solution containing a 1.0 x 10−4 M solution of HCl?

svetoff [14.1K]

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3 years ago

What is the mass of 2.3 x 10²¹ atoms of bromine?

liq [111]

Answer:0.305g

Explanation:

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3 years ago

1. An electric power plant uses energy from burning coal to generate steam at 450 °C. The plant is cooled by 20 °C water

kap26 [50]

Answer:

Explanation:

Efficiency of the electric power plant is $e=1-\frac{T_{2}}{T_{1}}$

Here Temperature of hot source $T_{1} = 450^{o}C=450+273=723 K$

and Temperature of sink $T_{1} = 20^{o}C=20+273=293 K$

Hence the efficiency is $e=1-\frac{293}{723}=0.5947=59.47%$

Now another formula for thermal efficiency Is

$e_{therm}=\frac{Q_{1}-Q_{2}}{Q_{1}}=\frac{W}{Q_{1}}$

Here QI is the of heat taken from source 100 MJ ; Q2 of heat transferred to the sink (river) to be found

W is the of work done and W = QI -Q2

Hence From $e_{therm}=\frac{Q_{1}-Q_{2}}{Q_{1}}=\frac{W}{Q_{1}}$

$W=e(Q_{1})=(0.5947)(100)=59.47MJ$

Hence the of heat transferred to the river Is $Q_{2} -W = (100 -59.47=40.53$

6 0

4 years ago