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-Dominant- [34]
4 years ago
8

What phenomenon in nature do scientists use to define the length of a meter? Why is this a better definition than “the length of

a standard meter stick”?
Chemistry
1 answer:
sergey [27]4 years ago
8 0

Answer:

The natural phenomenon used to describe the length of a meter is the speed of light. The length of a meter is the length a light path travels in 1/(299792458) seconds through a vacuum.

The definition is better due to the uncertainty involved in the use of the length of a standard meter stick because the length of the meter stick could change due to atmospheric conditions from place to place

Explanation:

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A chemical reaction in a lab experiment actually produces 1.23mol of BeBr2. The theoretical yield is 220g. To two decimal places
Mashutka [201]

Answer:

Percent yield = 94.62%

Explanation:

Given data:

Actual yield of BeBr₂ = 1.23 mol

Theoretical yield of BeBr₂ = 220 g

Percent yield = ?

Solution:

Theoretical yield in moles:

Number of moles = mass/molar mass

Number of moles = 220 g/168.82 g/mol

Number of moles = 1.30 mol

Percent yield:

Percent tiled = actual yield / theoretical yield × 100

by putting values,

Percent yield = 1.23 mol / 1.30 mol × 100

Percent yield = 0.9462 × 100

Percent yield = 94.62%

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3 years ago
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2 years ago
Calculate the mass in grams of hydrogen chloride produced when 5.15 l of molecular hydrogen measured at stp reacts with an exces
navik [9.2K]

Answer: 17.9 g


Explanation:


1) Chemical equation:


H₂ (g) + Cl₂ (g) → 2HCl (g)


2) mole ratios:


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3) Since, the pressure and temperature conditions do not change, the same proportion is valid for the volumes. Then:


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At STP, 1 mol of gas = 22.4 liter


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5) Use the molar mass to convert 0.491 mol to grams


molar mass of HCl = 1.008 g/mol + 35.453 g/mol = 36.461 g/mol


mass in grams = nuumber of moles × molar mass = 36.461 g/mol × 0.491 mol = 17.90 g.



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