Answer:
isotopes
Atoms with the same number of protons but different numbers of neutrons are called isotopes. Because the number of neutrons can vary for a given element, the mass numbers of different atoms of an element may also vary. For example, some helium atoms have three neutrons instead of two (these are called isotopes and are discussed in detail later on)
Explanation:
Answer:
D
Explanation:
∆H° = ∆Hf ° (products) – ∆Hf ° (reactants)
A tall, horizontally subdivided or packed container for fractional distillation in which vapor passes upward and condensing liquid flows downward. The vapor becomes progressively enriched in more volatile components as it ascends, and the less volatile components become concentrated in the descending liquid, which can be drawn off.
Answer:
37.18°C.
Explanation:
- The amount of heat absorbed by water = <em>Q = m.c.ΔT.</em>
where, Q is amount of heat absorbed by water (Q = 5.75 x 10⁵ J).
m is the mass of water (m = 2190 g).
c is the specific heat capacity of liquid water = 4.18 J/g°C.
ΔT is the temperature difference = (final T - initial T = 100.0°C - initial T).
∴ Q = m.c.ΔT = 5.75 x 10⁵ J.
5.75 x 10⁵ J = (2190 g)(4.18 J/g°C)(100.0°C - initial T)
∴ (100.0°C - initial T) = (5.75 x 10⁵ J)/(2190 g)(4.18 J/g°C) = 62.81°C.
<em>∴ initial T = (100.0°C - 62.81°C) = 37.18°C.</em>
To do this, we need molar mass, as well as Avogadro's Number.
To start, 1.60 x 10-12 grams C10H16O. Molar mass = 152.23 g/mol
Divide 1.60 x 10-12 grams by 152.23 g/mol to get a number in moles.
You should get 1.05 x 10-14 moles
From here, we use Avogadro's Numner, 6.022 x 10^23 molecules/mole.
Multiply our moles, 1.05 x 10-14 by 6.022 x 10^23
Answer:
6.33 x 10^9 molecules.
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