Answer:
50 metres per second.
Explanation:
Speed is the total distance covered divided by the time taken to cover that distance. Therefore, the plane's speed is obtained by dividing 450,000 metres by 9000 seconds, resulting in a speed of 50m/s.
Answer:
Mass = 19.53 g
Explanation:
Given data:
Number of atoms of iron = 2.10 ×10²³ atoms
Mass of iron = ?
Solution:
The number 6.022 ×10²³ is called Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
1 mole contain 6.022 ×10²³ atoms
2.10 × 10²³ atoms × 1 mol / 6.022 ×10²³ atoms
0.35 mol
Mass of iron atoms:
Mass = Number of moles × molar mass
Mass = 0.35 mol × 55.8 g/mol
Mass = 19.53 g
When the reaction equation is:
CaSO3(s) → CaO(s) + SO2(g)
we can see that the molar ratio between CaSO3 & SO2 is 1:1 so, we need to find first the moles SO2.
to get the moles of SO2 we are going to use the ideal gas equation:
PV = nRT
when P is the pressure = 1.1 atm
and V is the volume = 14.5 L
n is the moles' number (which we need to calculate)
R ideal gas constant = 0.0821
and T is the temperature in Kelvin = 12.5 + 273 = 285.5 K
so, by substitution:
1.1 * 14.5 L = n * 0.0821 * 285.5
∴ n = 1.1 * 14.5 / (0.0821*285.5)
= 0.68 moles SO2
∴ moles CaSO3 = 0.68 moles
so we can easily get the mass of CaSO3:
when mass = moles * molar mass
and we know that the molar mass of CaSO3= 40 + 32 + 16 * 3 = 120 g/mol
∴ mass = 0.68 moles* 120 g/mol = 81.6 g
Answer:
200 watts
Explanation:
First we have to find total work:
W =F(d)
W = 400J
Then plug that answer into the Power formula.
P = W/(t_f-t-i)
P = 400/2s
P = 200 W
<span>Atomic mass Cl = 8.9578 + 26.4968 = 35.45 amu</span>