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jok3333 [9.3K]
4 years ago
13

What units are used in the periodic table for atomic mass?

Chemistry
2 answers:
AleksAgata [21]4 years ago
5 0
D. amu
amu stands for atomic mass unit
choli [55]4 years ago
3 0
Atomic mass units (amu)
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At what temperature would a 1.15 m NaCl solution freeze, given that the van't Hoff factor for NaCl is 1.9? Kf for water is 1.86
MariettaO [177]

Answer:

-4.1°C

Explanation:

The freezing-point depression (ΔTf) is a colligative property that can be calculated using the following expression:

ΔTf = i × Kf × m

where,

i: van't Hoff factor

Kf: freezing-point depression constant

m: molality

ΔTf = 1.9 × 1.86°C/m × 1.15 m = 4.1 °C

The freezing-point of pure water is 0°C. The freezing-point of this solution is:

0°C - 4.1°C = -4.1°C

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4 years ago
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4 years ago
If you are given 608 grams of calcium phosphate Ca3(PO4)2, how many moles would you have? *
Anika [276]

Answer:

You would have 1.96 moles.

Explanation:

You are given 608 grams of calcium phosphate Ca₃(PO₄)₂.

Molar mass (M) is the amount of mass that a substance contains in one mole. This substance can be an element or a compound.

Since the molar mass of the compound Ca₃(PO₄)₂ is 310 g / mole, and taking into account the definition of molar mass, you can apply the following rule of three: if 310 grams of Ca₃(PO₄)₂ are contained in 1 mole, 608 grams of the compound in how many moles are present?

moles=\frac{608 grams* 1 mole}{310 grams}

moles= 1.96

<u><em>You would have 1.96 moles.</em></u>

6 0
3 years ago
Energy level of diagram​
nlexa [21]

Answer:

<em>The energy level diagram is used to represent the energy states available in each atom. When an electron is in an energy state, it emits nor absorbs radiation. A photon is emitted or absorbed when an electron transitions from one energy state to another.</em>

Explanation:

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3 years ago
The ocean has both deep currents and surface currents moving it around the Earth.
yulyashka [42]

Answer: 1

Explanation: This is true.

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3 years ago
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