Chemistry: The heat of combustion of pp is 42.7 mj kg1. if pp containers are urned in a waste-fired power station that generates electricity with an verall efficiency of 24%, calculate how much useful electrical energy generated when 1,200 tonnes of pp is burned. give your answer in nits of mj to 3 significant figures and explain your working

The heat of combustion of pp is 42.7 mj kg1. if - id42712303499, genyjoannerubiera

Ответ:

ari313

02.01.2022

Chemistry

$\boxed{2.23 \times 10^{7}{\text{ MJ}}}$

Explanation:

42.7 MJ/kg =42 700 MJ/t

1. Energy from PP

$\text{Energy from PP} = \text{1200 t PP} \times \dfrac{\text{42 700 MJ}}{\text{1 t PP}} = 5.12 \times 10^{7}\text{ MJ}$

2. Useful energy

$\text{Useful energy} = 5.12 \times 10^{7}\text{ MJ supplied } \times \dfrac{\text{ 24 MJ useful}}{\text{100 MJ supplied}} = 2.23 \times 10^{7}\text{ MJ useful}\\\\\text{The power plant supplies $\boxed{\mathbf{2.23 \times 10^{7}{\text{ MJ}}}}$ of useful energy}$

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starfox5454

08.12.2021

Chemistry

Dolphins use a method called echolocation to detect things such as obstacles and prey in the water. If a dolphin swimming in seawater at 25°C sends a 220-dB click with a frequency of 120.0 Hz, and then detects the reflection of the click exactly one-twentieth of a second later, approximately how far away is the object?

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