It was experimentally determined from three trials that an object had a density of 0.96, 0.99, and 0.95 g/mL. What is the averag
1 answer:
The mean of the sample is 0.97 while the standard deviation of the sample is 0.015.
<h3 /><h3>What is the average density?</h3>The average density is the sum of the density values divided by the total number of measurements.
In this case, we have three trials, the mean of the samples is
The standard deviation is obtained from;
s=
s =
s = 0.015
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Answer: 0.123 M
Explanation:
According to the neutralization law:
where,
= molarity of
solution = ?
= volume of
solution = 15.00 ml
= molarity of
solution = 0.100 M
= volume of
solution = 18.44 ml
= valency of
= 1
= valency of
= 1
Therefore, the concentration of the unknown HBr solution is 0.123 M
3.00097 x atoms are contained in 100.0 g of mercury.
The mole is defined as the amount of substance that contains as many elementary entities as there are atoms in exactly 12 g of carbon-12.”
Number of moles of mercury =
Number of moles of mercury =
= 0.4985 moles
Number of moles of mercury = Number of atoms = moles of Hg x
= 0.4985 x
= 3.00097 x atoms.
Hence, 3.00097 x atoms are contained in 100.0 g of mercury.
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