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3 years ago

What is 123 lbs in kg?

Chemistry

2 answers:

yarga [219]3 years ago

6 0

1 lbs ----------- 0.453592 kg
123 lbs -------- ??

123 x 0.453592 / 1 => 55.7919 kg

Softa [21]3 years ago

4 0

Answer: 55.7919lbs

Explanation:

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The two naturally occurring isotopes of antimony, 121Sb (57.21 percent) and 123Sb (42.79 percent), have masses of 120.904 and 12

Alex

Answer:

The correct answer is option c.

Explanation:

Formula used to determine an average atomic mass :

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$

Mass of isotope Sb-121 = 120.904 amu

Fractional abundance of Sb-121 = 57.21% = 0.5721

Mass of isotope Sb-123 = 122.904 amu

Fractional abundance of Sb-123 = 42.79% = 0.4279

Average atomic mass of Sb:

$120.904 amu\times 0.5721+ 122.904 amu\times 0.4279=121.7598 amu \approx 121.76 amu$

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3 years ago

What are the characteristics of Phosphate at room temperature?

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Answer: Phosphate is colorless , soft, waxy solid that glows in the dark when at room temperature.

Explanation:

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3 years ago

When scientists looked at the polarity of bands of rock on either side of the mid-ocean ridges, what did they find? A. that ther

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3 years ago

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The small 2 next to Nitrogen is called the ____.

klasskru [66]

1. Subscript is below
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3. Atoms
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4 years ago

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A balloon contains 2.0 L of air at 101.5 kPa . You squeeze the balloon to a volume of 0.25 L.

8_murik_8 [283]

<h3>Answer:</h3>

812 kPa

<h3>Explanation:</h3>

According to Boyle's law pressure and volume of a fixed mass are inversely proportional at constant absolute temperature.

Mathematically, $P\alpha \frac{1}{V}$

At varying pressure and volume;

P1V1=P2V2

In this case;

Initial volume, V1 = 2.0 L

Initial pressure, P1 = 101.5 kPa

Final volume, V1 = 0.25 L

We are required to determine the new pressure;

$P2=\frac{P1V1}{V2}$

Replacing the known variables with the values;

$P2=\frac{(101.5)(2.0L)}{0.25L}$

= 812 kPa

Thus, the pressure of air inside the balloon after squeezing is 812 kPa

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3 years ago