Answer: 3.28 mins
Explanation:
Here’s how it breaks down:
Conversions
74 mph = 33.08 m/s
6.5 km = 6500 m
(6500 m)/(33.08 m/s) = 196.5 seconds
196.5 seconds is equivalent to 3.28 minutes
Solution:
The molecular formula is PbSO₄, indicating lead sulfate
Option c.
Explanation:
The percentage makeup shows that in 100 g of this compound, there are:
68.3 g of Pb, 10.6 g of S, and (100 - 68.3 - 10.6) = 21.1 g of O
To find the moles of each element, we divide by their molar masses:
68.3 g Pb / 207.2 g/mol = 0.329 moles Pb
10.6 g S / 32.06 g/mol = 0.331 moles S
21.1 g O / 16 g/mol = 1.32 moles O
Next, we find the mole ratio by dividing each by the smallest number of moles:
0.329 / 0.329 = 1 Pb
0.331 / 0.329 = 1 S
1.32 / 0.329 = 4 O
Thus, the molecular formula is PbSO₄, representing lead sulfate.
E = mc²
where E = energy produced
m = mass of the nucleus
C = speed of light
m = 9.106 x 10⁻³ x 1.67 x 10⁻²⁷ kg
C = 3 x 10⁸ m/s, thus C² = 9 x 10¹⁶
E = 1.37 x 10⁻¹² J
Answer:
Protons: 19
Neutrons: 25
Electrons: 19
Explanation:
Protons:
The atomic number determines the number of protons in an atom. Consequently, with Potassium's atomic number being 19, it contains 19 protons.
Neutrons:
The formula to find neutrons is:
# of Neutrons = Atomic Mass - # of Protons
Given:
Atomic Mass = 43
# of Protons = 19
Thus,
# of Neutrons = 43 - 19
# of Neutrons = 24
Electrons:
In a neutral atom, the quantity of electrons matches that of protons. Therefore, a neutral Potassium atom with 19 protons must equally have 19 electrons.
Answer:
A pressure of 137.14 MPa exists 10,000 m beneath the ocean surface.
At this same depth, the density measures 2039 kg/m3.
Explanation:
P0 and ρ0 symbolize the pressure and density at sea level (indicative of atmospheric conditions). With an increase in ocean depth, both pressure and density likewise rise.
The relationship between pressure and density can be expressed as:
By rearranging
This equation allows for computation of P at 10,000 m beneath the ocean's surface:
The density found at a depth of 10,000 m in the ocean is
