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Inessa [10]
3 years ago
8

Can spectrophotometry results be improved by the use of graduated pipets instead of graduated cylinders.

Chemistry
1 answer:
Alenkinab [10]3 years ago
5 0
It’s c or cars or tr
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when liquid water changes into solid ice, it increases in mass

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What is the best solution to groundwater depletion?
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<span>Ground water depletion is one of the major problems. The best solution is to conserve water that we are having currently and to recycle those wasted water. water conservation can be done in many ways such as reduce the level of pumping the ground water, avoiding the use of chemicals, use of natural fertilizers, rain water saving, pumping water to the tanks from stored rain water in the ground, way of handling the water consuming jobs.</span>
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3 years ago
A couple is planning to have a child. the father-to-be has six fingers, a dominant trait. His genotype is Ff. His wife has five
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I think it’s C.1/2 because the child could get five fingers like his mother or six fingers like his dad
4 0
4 years ago
What is the theoretical yield of aluminum oxide if 1.40 mol of aluminum metal is exposed to 1.35 mol of oxygen?
vladimir2022 [97]

Answer:

71.372 g or 0.7 moles

Explanation:

We are given;

  • Moles of Aluminium is 1.40 mol
  • Moles of Oxygen 1.35 mol

We are required to determine the theoretical yield of Aluminium oxide

The equation for the reaction between Aluminium and Oxygen is given by;

4Al(s) + 3O₂(g) → 2Al₂O₃(s)

From the equation 4 moles Al reacts with 3 moles of oxygen to yield 2 moles of Aluminium oxide.

Therefore;

1.4 moles of Al will require 1.05 moles (1.4 × 3/4) of oxygen

1.35 moles of Oxygen will require 1.8 moles (1.35 × 4/3) of Aluminium

Therefore, Aluminium is the rate limiting reagent in the reaction while Oxygen is the excess reactant.

4 moles of aluminium reacts to generate 2 moles aluminium oxide.

Therefore;

Mole ratio Al : Al₂O₃ is 4 : 2

Thus;

Moles of Al₂O₃ = Moles of Al × 0.5

                         = 1.4 moles × 0.5

                         = 0.7 moles

But; 1 mole of Al₂O₃ = 101.96 g/mol

Thus;

Theoretical mass of Al₂O₃ = 0.7 moles × 101.96 g/mol

                                            = 71.372 g

7 0
3 years ago
How many oxygen atoms are in 1.90 g of quartz?
san4es73 [151]
The chemical formula for quartz is SiO₂. It has a molar mass of 60.08 g/mol. We use this to find the moles of quartz.

Moles of quartz = 1.90 g(1 mol/60.08 g) = 0.03162 moles

From the chemical formula, there are 2 moles of Oxygen per 1 mole of SiO₂.

Moles of oxygen = 0.03162 moles*2 = 0.063249 moles O

We use the Avogadro's number, 6.022×10²³ atoms/mole, to find the number of oxygen atoms.

0.063249 moles O * 6.022×10²³ atoms/mole = <em>3.81×10²² atoms of oxygen</em>
6 0
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