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The Princess cruise ship left San Francisco and traveled south for 8 hours at a speed of 30mph. What is the velocity of the ship
1 answer:
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Solution :
It is given that :
The formula of the compound =
And that 4.70 g of the sample contains mol of Br.
It means that :
1 mol of contains = 3 mol of Br
∴ 3 mol of contain in 1 mol of
mol of
contains
mol of
Thus the mol of =
mol
The given mass is = 4.700 g
Therefore, the of
= 298.4 g/mol
So of
=
of X + 3 x
of Br
298.4 g/mol = of X + 3 x 79.90 g/mol
298.4 g/mol = of X + 239.7 g/mol
of X = 58.71 g/mol (since 1 amu = 1 g/mol)
Therefore the atomic mass of the unknown metal = 58.71 g/mol
So the unknown meta is Nickel.
Answer: 2175.68 J heat is required to increase the temperature of 20 grams of water by 26 degrees celsius.
Explanation:
Given: Mass = 20 g
Change in temperature =
The standard value of specific heat of water is
Formula used to calculate the heat energy is as follows.
where,
q = heat energy
m = mass of substance
C = specific heat of substance
= change in temperature
Substitute the values into above formula as follows.
Thus, we can conclude that 2175.68 J heat is required to increase the temperature of 20 grams of water by 26 degrees celsius.