3 years ago

When coal is burned to produce electricity, the electrical energy produced is less than the

Chemistry

1 answer:

zimovet [89]3 years ago

3 0

Answer: it should be c or b

Explanation:

You might be interested in

In which state of matter do the particles spread apart and fill all the space available to them?

xz_007 [3.2K]

Gas, as the particles have the most energy, and thus move the most.

7 0

3 years ago

Can species be considered natural resources?

Firlakuza [10]

Answer:

yes, animals are a natural resources

7 0

3 years ago

Explain if the efficiency of a machine can ever be greater than 100%?

Marizza181 [45]

You should download Socratic with a good app!

3 0

3 years ago

Read 2 more answers

Someone please help :/

Alex73 [517]

Answer:

yes i will help

txt me. down and show what is the. project

7 0

2 years ago

What is the half-life of a pharmaceutical if the initial dose is 500 mg and only 31 mg remains after 6 hours?

Sergeu [11.5K]

Answer:

$\large \boxed{\text{b. 1.5 h}}$

Explanation:

1. Calculate the rate constant

The integrated rate law for first order decay is

$\ln \left (\dfrac{A_{0}}{A_{t}}\right ) = kt$

where

A₀ and A_t are the amounts at t = 0 and t

k is the rate constant

$\begin{array}{rcl}\ln \left (\dfrac{500}{31}\right) & = & k \times 6\\\\\ln 16.1 & = & 6k\\2.78& =& 6k\\k & = & \dfrac{2.78}{6}\\\\& = & 0.463 \text{ h}^{-1}\\\end{array}$

2. Calculate the half-life

$t_{\frac{1}{2}} = \dfrac{\ln2}{k} = \dfrac{\ln2}{\text{0.463 h}^{-1}} = \textbf{1.5 h}\\\\ \text{The half-life is $\large \boxed{\textbf{1.5 h}}$}$

4 0

3 years ago