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liberstina [14]
3 years ago
15

How many atoms in 134 moles of an element B?

Chemistry
2 answers:
Elden [556K]3 years ago
5 0

Answer:

8.06948e+25 atoms

Explanation:

mole = number of particles/avogadro number

number of atoms = mole × avogadro number

number or atoms = (134) x (6.022× 10²³) = 8.06948e+25 atoms

Marina86 [1]3 years ago
4 0

Answer:

8.06966961e+25

Explanation:

Atom = Mole / 6.0221415E+23

1 Mole = 6.0221415E+23 Atom

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2 years ago
A 25.0 g sample of an alloy was heated to 100.0 oC and dropped into a beaker containing 90 grams of water at 25.32 oC. The tempe
kaheart [24]

Answer:

The specific heat of the alloy C_{a} = 0.37 \frac{KJ}{Kg K}

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Mass of an alloy m_{a} = 25 gm

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Mass of water m_{w} = 90 gm

Initial temperature of water T_{w} = 25.32 °c = 298.32 K

Final temperature T_{f} = 27.18 °c = 300.18 K

From energy balance equation

Heat lost by alloy = Heat gain by water

m_{a} C_{a}  [T_{a} - T_{f}] = m_{w} C_w (T_{f} -T_{w} )

25 × C_{a} × ( 373 - 300.18 ) = 90 × 4.2 (300.18 - 298.32)

C_{a} = 0.37 \frac{KJ}{Kg K}

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Bài 1. Có 30g dung dịch NaCl 20%. Tính nồng độ % dung dịch thu được khi
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Answer:

Bài 1. Có 30g dung dịch NaCl 20%. Tính nồng độ % dung dịch thu được khi

a. Pha thêm 20g H2O

b. Cô đặc dung dịch để chỉ còn 25g.

6 0
3 years ago
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