Chemistry College

HRISTINA HERRERA: Attempt 1
Question 9 (2.5 points)
3
Which of the following sets of data are consistent with the law of conservation of
matter?
6
7.5 g of hydrogen gas reacts with 50.0 g oxygen gas to form 57.5 g of water.
9
50 g gasoline reacts with 243 g oxygen to form 206 g of carbon dioxide and 97 g
water
12
17.7 g nitrogen react with 34.7 g oxygen to form 62.4 g nitrogen dioxide.
all of these
15
none of these

Answers

Answer 1

Answer:

7.5 g of hydrogen gas reacts with 50.0 g oxygen gas to form 57.5 g of water.

Explanation:

Here we have the check if the mass of the reactants is equal to the mass of the products.

Reactants

[tex]7.5+50=57.5\ \text{g}[/tex]

Products

[tex]57.5\ \text{g}[/tex]

The data is consistent with the law of conservation of matter.

Reactants

[tex]50+243=293\ \text{g}[/tex]

Products

[tex]206+97=303\ \text{g}[/tex]

The data is not consistent with the law of conservation of matter.

Reactant

[tex]17.7+34.7=52.4\ \text{g}[/tex]

Products

[tex]62.4\ \text{g}[/tex]

The data is not consistent with the law of conservation of matter.

Only the first data is consistent with the law of conservation of matter.

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Does warm air rise or fall?

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Rise and cold air falls

rise and cold air

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How many moles of O2 are in 125 grams of CO2?
(this is a gram to mole conversion) HELP ME PLEASE!!!

Answers

Answer:

20 mole of co2

Explanation:

I hope this helps

If one iron nail weighs 2.0 grams, what would be the mass of 6.022 x 10^23 nails?

Answers

Answer:

[tex]1.2x10^{24}g[/tex]

Explanation:

Hello!

In this case, it is possible to treat this problem by using a proportional factor which indicates one iron nail equals 2.0 grams:

[tex]\frac{2.00g}{1nail}[/tex]

Now, for an amount of 6.022x10²³ nails, the corresponding mass will be:

[tex]6.022x10^{23}nail*\frac{2.00g}{1nail} \\\\1.2x10^{24}g[/tex]

Best regards!

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