3 years ago

20 points to whoever can answer these 3 questions correctly

Chemistry

1 answer:

Mkey [24]3 years ago

8 0

Answer:

1) A. NO

2) B. 4

3) D. 8

Explanation:

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1. The mass of 6.45 x 1022 atoms C

Fed [463]

Answer:

$\large \boxed{\text{1.29 g}}$

Explanation:

We must convert atoms of C to moles of C and then to grams of C.

1. Convert atoms to moles

$\text{Moles of C} = 6.45 \times10^{22}\text{ atoms C} \times \dfrac{\text{1 mol C}}{6.022 \times\ 10^{23} \text{ atoms C}} = \text{0.1071 mol C}$

2. Convert moles to grams

$\text{Mass of C} = \text{0.1071 mol C} \times \dfrac{\text{12.01 g C}}{\text{1 mol C}} = \text{1.29 g C}\\\text{The mass of C is $\large \boxed{\textbf{1.29 g}}$}$

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What is another name for a column of elements

liberstina [14]

A column of elements is a period

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What is the final concentration of the solution produced when 225.5 mL of 0.09988-M solution of Na2CO3 is allowed to evaporate u

ikadub [295]

Explanation:

The given data is as follows.

$V_{1}$ = 225.5 mL, $V_{2}$ = 45.00 mL

$M_{1}$ = 0.09988 M, $M_{2}$ = ?

Therefore, formula to calculate final concentration will be as follows.

$M_{1}V_{1}$ = $M_{2}V_{2}$

Putting the given values into the above formula as follows.

$M_{1}V_{1}$ = $M_{2}V_{2}$

$0.09988 M \times 225.5 mL$ = $M_{2} \times 45.0 mL$

$M_{2}$ = 0.5 M

Thus, we can conclude that the final concentration of the given solution is 0.5 M.

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Liquid hexane (CH3(CH2)4CH3) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O)

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2 years ago

What is the percent lithium in lithium nitrate?

seropon [69]

Answer:

Around 60%

Explanation:

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