He thought elements that haven't been discovered belonged in the place of the gap. He could also use the atomic mass of the missing elements
Answer:
<u>The estimated digit is 5</u>
Explanation:
Significant figures are the digits of a number that carry meaning and contribute to the precision of the given number or measurement.
Whereas, the estimated digit in a number is the last significant figure of the given number or measurement
Therefore, the given measurement
78.5 L: has three significant figures, because the non-zero digits are considered significant figures.
The estimated digit is 5, as it is the last significant figure of the measurement.
151.55 x 4 you have to add the molar masses for each element together.
Answer:
they have same number of electrons
This is an incomplete question, here is a complete question.
A certain first-order reaction has a rate constant of 5.50 × 10⁻³ s⁻¹. How long will it take for the reactant concentration to drop to 1/8 of its initial value?
Answer : The time taken will be, 378.1 s
Explanation :
Expression for rate law for first order kinetics is given by:
where,
k = rate constant =
t = time passed by the sample = ?
a = let initial amount of the reactant = x
a - x = amount left after decay process =
Now put all the given values in above equation, we get
Thus, the time taken will be, 378.1 s