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Svet_ta [14]
3 years ago
8

Anyone know the answer to number 1?

Chemistry
1 answer:
Andrew [12]3 years ago
5 0
The rate at which the substance dissolves in water.
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Convert 4.50 moles of fe to atoms of fe
Rina8888 [55]
<span>Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We do as follows:

4.50 mol Fe ( 6.022x10^23 atoms / 1 mol Fe ) = 2.71x10^24 atoms Fe present </span>
7 0
3 years ago
The volume of the aquarium in our classroom is 1890 L. The density of seawater is 1.03g/cm^3. What is the mass of the water in o
guapka [62]
Density can be calculated using the following rule:
density = mass / volume
therefore,
mass = density x volume
From the givens:
we have the density = 1030 kg/m^3 and volume = 1.89 m^3

Substitute in the equation to get the mass as follows:
mass = 1030 x 1.89 = 1.9467 x 10^3 kg
5 0
3 years ago
A. The half-life for a first order reaction in 49 minutes. What is the rate constant?B.For a second order reaction, the half-lif
Burka [1]

Answer:

a) 0,014 min⁻¹

b) 1452 seconds.

c) 0,02156 M

d) The faster rate is for the reaction A. The largest rate constant, k, is for A reaction

Explanation:

a) For a first order reaction the half-life is:

t_{1/2} = \frac{ln(2)}{k} <em>(1) </em>As half.life is 49 min. Rate constant -k- is: 0,014 min⁻¹

b) The half-life is defined as the time that takes in descompose the half of the initial concentration of a compound.

As half-life is 726s. In 726s the concentration will be 0,300M, In the next 726s the concentration will be 0,150M. Thus, thae time it takes to decrease concentration until 0,150M is 726s×2= 1452 seconds

c) In the same way, 11072 years are 4 half-life for this reaction, thus:

0,345M/2⁴ = 0,02156 M

d) By definition of half-life, the less half-life, the faster rate. Thus, The faster rate is for the reaction A.

By (1) half-life is inversely proportional to rate constant. Thus, the less half-life, the largest rate constant. The largest rate constant, k, is for A reaction

I hope it helps!

7 0
3 years ago
PLS HELP ASAP!! I will do brainliest!!!! PLS IMMA DIE
Bess [88]
B. combination of all wavelengths of visible light
3 0
3 years ago
Read 2 more answers
It refers to a charged particle or atom.
Kay [80]
<h2><u>QUE</u><u>STION</u></h2>

It refers to a charged particle or atom.

<h2><u>CHOI</u><u>CES</u></h2>

<u>A.</u><u> </u><u>molecule</u>

B. bromine

C. potassium

D. sulfur

<h2><u>ANSWER</u></h2>

<h3><u>C</u><u>.</u><u> </u><u>pottasium</u></h3>
7 0
3 years ago
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