If we laid each atom end-to-end, they would reach about 20 times the distance from Earth to the Moon.
<em>Assum</em>e that sand has a density of 2 g/cm³ and consists of units of SiO₂.
<em>V</em> = 1 mm³ × (1cm/10 mm)³ = 1 × 10⁻³ cm³
Mass = 1 × 10⁻³ cm³ × (2 g/1 cm³) = 2 × 10⁻³ g
Moles of SiO₂ = 2 × 10⁻³ g × (1 mol SiO₂/60.08 g SiO₂) = 3 × 10⁻⁵ mol SiO₂
Units of SiO₂ = 3 × 10⁻⁵ mol SiO₂ × (6.022 × 10²³ units SiO₂/1 mol SiO₂)
= 2 × 10¹⁹ units SiO₂
Atoms = 2 × 10⁻¹⁹ units SiO₂ × (3 atoms/1 unit SiO₂) = 6 × 10¹⁹ atoms
<em>Assume</em> that each atom has a diameter of 140 pm. If we laid them end to end, they would stretch for
6 × 10¹⁹ atoms × (140 × 10⁻¹² m/1 atom) = 8 × 10⁹ m = 8 × 10⁶ km
That’s 20 times the distance from Earth to he Moon.
Answer:
The answer to the question is
The mass of the water in the container, assuming that all the heat lost by the copper is gained by the water is 116.23 grams
Explanation:
To solve this we list out the variables thus,
mass of copper = 110g
specific heat capacity of copper = 0.20 j/C g
Initial temperature of copper = 82.4 C
Final temperature of copper and water = 24.9 C
therefore
From the formula for sensible heat, ΔH = m×c×ΔT
we have, where
H = senced heat,
m = mass,
ΔT = temperature change
110 × 0.20 × (82.4 - 24.9) = mw × 4.186 × (24.9 - 22.3)
1265 J = mw ×10.8836 or mw = 116.23 g
Therefpre the mass of water is 116.23 g
Answer:
2 g
Explanation:
Since both sides have to be equal, add together the weight from the left side to get the total of 137
Subtract 135 from that
The answer is 2.
Answer:
<h3>The answer is 12.5 g</h3>
Explanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 2.5 × 5
We have the final answer as
<h3>12.5 g</h3>
Hope this helps you