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3 years ago

Which material is a mixture 1 water 2 air 3 methane 4 magnesium

Chemistry

1 answer:

amm18123 years ago

8 0

Answer: Air

Explanation: Pure air is a mixture of several gases that are invisible and odorless. Consists of 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide.

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If 14.3 moles of H2O2 is decomposed, how many grams of oxygen gas are produced?

Studentka2010 [4]

The balanced chemical reaction would be as follows:

2H2O2 = 2H2O + O2

We are given the amount of the peroxide that decomposes. Using this as the starting point for the calculations, we can determine the amount of O2 produced. We do as follows:

14.3 mol H2O2 ( 1 mol O2 / 2 mol H2O2 ) = 7.15 mol O2 produced

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3 years ago

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Which of the following molecules or ions has a bent shape?

Dovator [93]

It’s c I believe but I don’t know

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3 years ago

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Find the mass of 3.90*10^23 molecules of carbon dioxide

enyata [817]

Answer: 28.5 g

Explanation:

1 mole of every substance contains Avogadro's number of particles and weighs same as it's molecular weight.

Here 1 mole of $CO_2$ contains $6.023\times 10^{23}$ molecules of $CO_2$ and it weighs $44g$

$6.023\times 10^{23}$ molecules weigh 44g

$3.90\times 10^{23}$ molecules weigh = $\frac{44g}{6.023\times 10^{23}}\times 3.90\times 10^{23}$

= 28.5g

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4 years ago

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In the reaction between NaNO3 (aq) and Li2SO4 (aq), will a precipitate form?

lara31 [8.8K]

<u>Answer:</u> The correct answer is No, this reaction produces no insoluble products.

<u>Explanation:</u>

Precipitate is defined as the insoluble salt which emerges when two different solutions are mixed together. It settles down at the bottom of the flask after some time.

The balanced chemical equation for the reaction of sodium nitrate and lithium sulfate follows:

$2NaNO_3(aq.)+Li_2SO_4(aq.)\rightarrow Na_2SO_4(aq.)+2LiNO_3(aq.)$

By Stoichiometry of the reaction:

2 moles of aqueous solution of sodium nitrate reacts with 1 mole of aqueous solution of lithium sulfate to produce 1 mole of aqueous solution of sodium sulfate and 2 moles of aqueous solution of lithium nitrate.

All the products are aqueous solution and thus, no precipitate is formed.

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3 years ago

Which series reveals the source of energy for oil? please help ASAP!!! WILL MARK BRAINLEST

Murrr4er [49]

Answer:

Explanation:

Oil > Animals > Plants > Chemicals

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