1,645.6 expressed in scientific notation equals?
2 answers:
Answer : The correct representation is,
Explanation :
Scientific notation : It is defined as the method or a way or representation of expressing the given number which are too big or too small that is written in the decimal form. That means, it always written in the power of 10 form.
For example : 8000 is written as,
As we are given the digit which is, 1645.6
This number is written in scientific notation as :
Therefore, the correct representation is,
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Number of moles is defined as the ratio of given mass in g to the molar mass.
First, convert the given mass of carbon dioxide in mg to g:
1 mg = 0.001 g
17.61 mg = 0.01761 g
Number of moles of carbon dioxide =
=
Mass of carbon = number of moles of carbon dioxide \times molar mass of carbon
=
=
Number of moles of water=
=
Since, water contains two hydrogen atoms. Thus,
Moles of hydrogen =
=
Mass of hydrogen =
=
Mass of oxygen =
=
Number of moles of oxygen =
=
Now,
Divide the smallest number to get the whole number,
we get,
Now, multiply all the subscript by 3 to get the whole number,
(empirical fomula)
Molar mass of the compound =
=
Divide given molar mass of the compound with the molar mass of the compound.
=
=
Thus, multiply the subscripts of empirical formula by 2 to get the molecular formula, we get:
Hence, empirical formula is and molecular formula is