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storchak [24]
3 years ago
12

Which apparatus is used in measuring a base in laboratory? Show Options a.  pipette b. measuring cylinder c. burette d. conical

flask​
Chemistry
1 answer:
mixas84 [53]3 years ago
8 0

Answer:

your answer is burette.

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5.40 g B determine the number of atoms
sdas [7]
Atomic mass Boron ( B ) = 10.811 u.m.a

10.811 g -------------- 6.02x10²³ atoms
5.40 g ----------------- ?? atoms

5.40 x ( 6.02x10²³) / 10.811 =

3.0069x10²³ atoms
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3 years ago
List three common counting units and their values.
emmasim [6.3K]
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3 years ago
How many moles of koh are contained in 250 ml of a 2.0 m solution of koh
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.5 mols
Assuming that your 2.0 m is an M for molarity
I used the formula M=number of mold/L
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4 0
3 years ago
How many moles of gas occupy 98L at a pressure of 2.8atm and a temperature of 292k? and what law would you use?
algol13
Let's assume that the gas has ideal gas behavior.

Then we can use ideal gas equation,
PV = nRT

Where, P is Pressure of the gas (Pa), V is volume of the gas (m³), n is the number of moles of gas (mol), R is the Universal gas constant (8.314 J mol⁻¹ K⁻¹) and T is the temperature in Kelvin (K)

The given data for the gas is,
P = 2.8 atm = 283710 Pa
V = 98 L = 98 x 10⁻³ m³
T = 292 K
R = 8.314 J mol⁻¹ K⁻¹
n = ?

By applying the formula,
283710 Pa x 98 x 10⁻³ m³ = n x 8.314 J mol⁻¹ K⁻¹ x 292 K
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Hence,moles of gas is 11.45 mol.
8 0
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Which of the following reactions would you find in a radioisotope thermal generator?
Mars2501 [29]
The 3rd option


because i’m always right:)
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