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3 years ago

44. If there are 2.54 cm in an inch and 12 inches in a foot, how many cm are in 1.50 feet

Chemistry

1 answer:

lutik1710 [3]3 years ago

7 0

Answer:

45.72 cm

Explanation:

We are told that there are 2.54 cm in an inch and 12 inches in a foot.

Since 1 inch = 2.54 cm

Then, 12 inches = (12 × 2.54)/1 = 30.48 cm

Now, 12 inches makes 1 foot.

Thus, 1 ft = 30.48 cm

Thus, 1.5 ft = (1.5 × 30.48)/1 = 45.72 cm

Thus, 45.72 cm will make 1.5 feet

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What mass of HgO is required to produce 0.692 mol of O2? 2HgO(s) -> 2Hg(l) + O2(g)

Vika [28.1K]

The answer for the following problem is mentioned below.

Therefore 298.44 grams of mercuric oxide is needed to produce 0.692 moles of oxygen molecule

Explanation:

Given:

no of moles of the oxygen gas = 0.692

Also given:

2 HgO → 2 Hg + $O_{2}$

where,

HgO represents mercuric oxide

Hg represents mercury

$O_{2}$ represents oxygen

To calculate:

Molar mass of HgO:

Molar mass of HgO = 216 grams

molar mass of mercury (Hg) = 200 grams

molar mass of oxygen (O) =16 grams

HgO = 200 +16 = 216 grams

We know;

2×216 grams of HgO → 1 mole of oxygen molecule

? → 0.692 moles of oxygen molecule

= $\frac{2*216*0.692}{1}$

= 298.944 grams of HgO

Therefore 298.44 grams of mercuric oxide is needed to produce 0.692 moles of oxygen molecule

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3 years ago

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Determine the mass of 4.25x10^26 formula units of barium hydroxide

Andru [333]

$4.25x10x^{26}$

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3 years ago

A pure white crystalline compound was found to melt at 112.5-113.0oC when taken on a melting point apparatus, and on further hea

Sergeeva-Olga [200]

According to the question, the determined melting point of the compound is 112.5-113.0oC. When the solidified compound was retried, the melting point was found to be 133.6-154.5oC. This greater range higher than 112°C is caused by reusing samples leads to errors.

A pure sample is known by its sharp melting point. A pure sample does not melt over a large range. We can see this in the predetermined melting points of the pure sample(112.5-113.0oC).

However, reusing a sample introduces errors because the pure sample may become contaminated leading to a larger and higher range of melting point (133.6-154.5oC) which is far above 112°C.

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3 years ago

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Leno4ka [110]

Answer:

The main difference between the two models is the position of the electron in the atom.

Explanation:

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Electron cloud model: It is supposed by Erwin Schrodinger. He showed that the emission spectra of the atom is the way to detect the probability of electron position.

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3 years ago

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How many millimeters are in 251 cm?

antoniya [11.8K]

Answer:

2510

Explanation:

Since there are 10 milimetres in 1 centimetre, 1 cm = 10mm

There are 10 times as many milimetres as centimetres.

251cm X 10 = mm

251cm = 2510mm