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Phantasy [73]
4 years ago
15

1. After clamping a buret to a ring stand, you notice that the set-up is tippy and unstable. What should you do to stabilize the

set-up?
A. Move the buret clamp to a ring stand with a larger base.
B. Hold the buret in place by hand during the titration.
C. Use a different size buret that is more stable in the set-up
D. Clamp another buret to the ring stand to balance out the set-up.
Chemistry
1 answer:
Elza [17]4 years ago
4 0

Answer:

A. Move the buret clamp to a ring stand with a larger base.

Explanation:

The ring stands are used to hold burettes, light in weight to avoid loss of stability, that is why it is necessary to change the size of the ring stand so that it can support the buret that we are going to use.  It is not recommended to balance it with the hand since it would give us an inaccurate result in the titration.

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I think the correct answer would be false. The atomic mass of chlorine does not represent the mass of the most common naturally occurring isotope of chlorine. The atomic mass of any compound is the average of the atomic masses of the naturally occurring isotopes of an element. <span />
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4 years ago
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If 2.06 mL of seawater contains about 0.446 moles of gold, how many atoms of gold are in that volume of seawater?
Alborosie

Answer:

2.69 x 10²³ atoms

Explanation:

Given parameters:

Volume of sea water = 2.06mL

number of moles of gold = 0.446moles

unknown:

Number of atoms in the sea water

Solution:

The mole is a convenient unit of measuring quantities of particles. In a mole we have 6.02 x 10²³particles.

The mole can be defined as the amount of a substance contained in Avogadro's number of particles which is 6.02 x 10²³particles.

Here, the particles we want to determine is the number of atoms:

Number of atoms is given as:

   Number of gold atoms = number of moles of gold x 6.02 x 10²³

  Number of gold atoms = 0.446 x 6.02 x 10²³ = 2.69 x 10²³ atoms

5 0
4 years ago
WILL AD BRAINLIST write 5 sentences you have learned from observing rock samples. make sure to include what you know about your
Inessa [10]
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3 years ago
What is a limiting reagent?
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It is the substance that is totally consumed when the chemical reaction is complete....
6 0
4 years ago
typical room is 4.0 m long, 5.0 m wide, and 2.5 m high. What is the total mass of the oxygen in the room assuming that the gas i
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Answer:

mass of oxygen gas in Kg = 15.0Kg

Explanation:

Volume of air in the room = 4.0m*5.0m*2.5m = 50m³

volume of oxygen in the room = 21/100 *  50m³ = 10.5m³

using the ideal gas equation; PV=nRT

number of moles of oxygen gas, n = PV/RT

At STP, P = 1atm, V = 10.5m³ = (10.5*1000)dm³ = 10500dm³, R = 0.082 atmdm³K⁻¹mol⁻¹, T = 273K

n = 1 * 10500/ (273 *0.082)

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mass of oxygen gas in Kg = (469.04 * 32)/1000

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