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3 years ago

CO2

Chemistry

2 answers:

vesna_86 [32]3 years ago

7 0

C.ELEMENT AND COMPOUNDS

PolarNik [594]3 years ago

6 0

Answer:

D) compounds and pure substances.

Explanation:

All three items are examples of compounds and pure substances. They are not pure elements or molecules.

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REY [17]

Answer:

Explanation:

this is easy its a

8 0

3 years ago

What is the percent composition of N H S O in (NH4)2SO4

Lena [83]

Answer:

The percent composition is 21% N, 6% H, 24% S and 49% O.

Explanation:

1st) The molar mass of (NH4)2SO4 is 132g/mol, and it represents the 100% of the mass composition.

In 1 mole of (NH4)2SO4, there are:

- 2 moles of N.

- 8 moles of H.

- 1 mole of S.

- 4 moles of O.

2nd) It is necessary to calculate the mass of each element, multiplying its molar mass by the number of moles:

- 2 moles of N (14g/mol) = 28g

- 8 moles of H (1g/mol) = 8g

- 1 mole of S (32g/mol) = 32g

- 4 moles of O (16g/mol) = 64g

3rd) With a mathematical rule of three we can calculate the percent composition of each element in the molecule of (NH4)2SO4:

$\begin{gathered} \text{ Nitrogen:} \\ 132g-100\% \\ 28g-x=\frac{28g*100\%}{132g} \\ x=21\% \end{gathered}$ $\begin{gathered} \text{ Hydrogen:} \\ 132g-100\operatorname{\%} \\ 8g-x=\frac{8g*100\operatorname{\%}}{132g} \\ x=6\% \end{gathered}$ $\begin{gathered} \text{ Sulfur:} \\ 132g-100\operatorname{\%} \\ 32g-x=\frac{32g*100\operatorname{\%}}{132g} \\ x=24\% \end{gathered}$ $\begin{gathered} \text{ Oxygen:} \\ 100\%-21\%-6\%-24\%=49\% \\ \\ \end{gathered}$

In this case, we can calculate the percent composition of Oxygen by subtracting the other percentages, since the total must be 100%.

So, the percent composition is 21% N, 6% H, 24% S and 49% O.

8 0

1 year ago

What willl happen if we nuke the sun some how

iogann1982 [59]

Answer:

The sun'll likely absorb the radiation if it is close enough (Which it will never be)

Explanation:

4 0

3 years ago

Read 2 more answers

What are the 6 steps to solving a mass-mass problem

aev [14]

Answer:

Write a balanced equation for the reaction.

Write the given mass on a factor-label form.

Convert mass of reactant to moles of reactant.

Convert moles of reactant to moles of product.

Convert moles of product to grams of product.

Pick up the calculator and do the math.

Explanation:

Can I get Brainiest.

4 0

4 years ago

Which of the following lists of elements are in the same PERIOD? *

yuradex [85]

Ca, V, Cu, Kr
Remember a period is a the horizontal rows in the Periodic Table.

5 0

3 years ago