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3 years ago

How does Perth’s water cycle work?

1 answer:

4 0

It is a global issue that is impacting WA’s water supply and our way of life. The impacts are felt across the world, Australia, and throughout WA in our communities, businesses, farms and homes.

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) How many molecules are in 23 moles of Sodium?

densk [106]

4)<span>1.24⋅<span>1024</span></span><span> formula units

</span>1 mole Na<span> (sodium)</span>

6 0

3 years ago

What is the lowest temperature that a substance can reach?

kobusy [5.1K]

Absolute zero that means cooling - 0 degree

3 0

3 years ago

At a certain temperature the rate of this reaction is first order in HI with a rate constant of :0.0632s

Shalnov [3]

Answer : The time taken for the reaction is, 28 s.

Explanation :

Expression for rate law for first order kinetics is given by :

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = 0.0632

t = time taken for the process = ?

$[A_o]$ = initial amount or concentration of the reactant = 1.28 M

$[A]$ = amount or concentration left time 't' = $1.28\times \frac{17}{100}=0.2176M$

Now put all the given values in above equation, we get:

$0.0632=\frac{2.303}{t}\log\frac{1.28}{0.2176}$

$t=28s$

Therefore, the time taken for the reaction is, 28 s.

8 0

3 years ago

Calculate the number of grams in sodium in 7.6g of Na2C6H6O7 (sodium hydrogen citrate) express your answer using two significant

Katen [24]

Answer:

Explanation:

the molecular mass of Na2C6H6O7 =236 g\mole it has a sodium that has 23 g/mole so 7.6 g of Na2C6H6O7 has x of sodium mass

236 g/mole ⇒ 23g/mole

7.6 x 23 ÷ 236 = 74.07×10-2 grams of sodium

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7 0

3 years ago

Name the following compound:<br> CH3-CH2-CH2-CH2-CH3<br> CH3 CH3

stepan [7]

Answer:

<u><em>Pentane </em></u>

Explanation:

since we have in here CH3-CH2-CH2-CH2-CH3 5 Carbon atoms and 12 Hydrogen making it $C_{5} H_{12}$

6 0

3 years ago