Expanding the following out of scientific notation gives:
1. 1.5×
cm= 15000cm
2. 2.7×
cm= 0.0027cm
Numbers that are either too large or too little to be conveniently stated in decimal form can be expressed using scientific notation. It is also known as standard form in the UK and scientific form, standard index form, and standard form.
Using scientific notation, one can express extremely big or extremely small values. When a number between 1 and 10 is multiplied by a power of 10, the result is represented in scientific notation.
So, the expanded forms are;
1. 1.5× cm= 15000cm
2. 2.7× cm= 0.0027cm
Learn more about scientific notation here;
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The relative atomic mass of Boron in trimethyl borate [(CH3O)3B] is; 10.8
<h3>Isotopes and Relative abundance</h3>
According to the question;
- Since, ¹¹B is 4 times more abundant than ¹⁰B;
The relative abundance of Boron in the spectrum is;
Relative atomic mass = (80% of 11) + (20% of 10)
Hence, the relative atomic mass of Boron in trimethyl borate [(CH3O)3B] is; 10.8
Read more on Isotopes;
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Answer:
The final temperature of the mixture is 22.3°C
Explanation:
Assuming that the 120 g substance at 80°C is water, final temperature of the mixture can be determined using the formula:
Heat lost = Heat gained
Heat = mc∆T where m is mass, c is specific heat capacity of water, and ∆T is the temperature change =<em> Tfinal - Tinitial</em>.
Let the final temperature be T
Heat lost = 120 × c × (T - 80)
Heat gained = 3000 × c × ( T - 20)
Equating the heat lost and heat gained
120 × c × -(T - 80) = 3000 × c × (T - 20)
9600 - 120T = 3000T - 60000
60000 + 9600 = 3000T + 120T
69600 = 3120T
T = 69600/3120
T = 22.3°C
Therefore, the final temperature of the mixture is 22.3°C
