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Nina [5.8K]
3 years ago
6

A student measures the sides of a piece of paper to determine the area of the paper. His measurements are: 5.70 cm length and 10

.22 cm width. What is the area of the paper (recorded to the correct number of significant figures)?
Chemistry
1 answer:
Basile [38]3 years ago
4 0

Answer:

58.254

Explanation:

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Coke is an impure form of carbon that is often used in the in- dustrial production of metals from their oxides. If a sample of c
steposvetlana [31]

Answer:

The mass of coke needed to react completely with 1.0 ton of copper(II) oxide is 0.794 Ton.

Explanation:

2CuO+C\rightarrow 2Cu+CO_2

1 Ton = 907185 grams

Mass of copper oxide = 1.0 Ton = 907185 grams

Moles of copper oxide =\frac{907185 g}{79.55 g/mol}=11,403.95 moles

According to reaction, 2 moles of copper oxide reacts with 1 mole of carbon.

Then 11403.95 moles of copper oxide will react with:

\frac{1}{2}\times 11403.95 mol=5,701.98 mol of carbon

Mass of 5,701.98 moles of carbon:

5,701.98 mol\times 12 g/mol=68,423.75 g

Mass of coke = x

Mass of carbon = 68,423.75 g

Percentage of carbon in coke = 95%

95\%=\frac{68,423.75 g}{x}\times 100

x=720,250.09 g=0.794 Ton

The mass of coke needed to react completely with 1.0 ton of copper(II) oxide is 0.794 Ton.

3 0
3 years ago
What name should be used for the ionic compound LiI? lithium iodide lithium monoiodide monolithium iodide monolithium monoiodide
MariettaO [177]

Answer:

The correct option is A. Lithium Iodide

Explanation:

According to the system for naming an ionic compound, the name of the metal ion is always written first and the name of the non-metal ion is written after it.

Lithium is a metal whose ion is named as lithium ion Li+ and Iodine is a non-metal whose ion name is iodide and is written as I-. The charges on metal atoms depend on the number of group they are present on, in the periodic table. The charge on the non-metal ion would be the group number minus eight. Hence, lithium iodide is the correct answer.

6 0
3 years ago
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Which formula represents lead(II) hydroxide?
frez [133]
Pb(OH)2


This is the formula
5 0
3 years ago
WHATS THE ANSWER FOR THIS QUESTION?
balu736 [363]

Answer:

lower is write answer is am write

7 0
3 years ago
For this question, use the main assumptions of the Kinetic Molecular Theory of gases:
Gennadij [26K]
<h2>Answer:</h2>

Option 3 is correct.

3. The molecular collisions are perfectly elastic.

<h2>Explanation:</h2>

According to the kinetic molecular theory, the molecular collisions are perfectly elastic, so the the molecules of a gas striking with the wall of container are elastic and they are exerting considerable pressure on the walls of container. This pressure is actually exerted against the walls is less for real gases as compared to ideal gases.

5 0
3 years ago
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