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oksano4ka [1.4K]

2 years ago

10

Please help, this is stem class!! Due in 30 minutes!!

2 answers:

7nadin3 [17]2 years ago

8 0

Answer: .....

Explanation:

Leto [7]2 years ago

8 0

answer it your self mate

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Propane (c3h8) is burned in oxygen to produce carbon dioxide and water. the heat of combustion of propane is -2012 kj/mole. how

Olegator [25]

$C_{3} H_{8} + 5 O_{2} ---\ \textgreater \ 3CO_{2} +4H_{2}O (-2012 \frac{kJ}{mol} )


3 mol 10 mol


C_{3}H_{8} is /excess /reactant

because 3 mol propane require 15 mol oxygen (by reaction)

5 mol oxygen ---1 mol propane, so

10 mol oxygen ---2 mol propane

Only 2 mole propane will be burned,

so 

2012 ( kJ/mol)*2 mol =4024 KJ heat will be given off

Correct answer is number 4.


$

5 0

2 years ago

n the periodic table, the atomic mass of oxygen is listed as 15.9994 amu. Based on this, one can deduce that the most common ___

Anit [1.1K]

Isotope- variation of an element

Sixteen- atomic number of oxygen

4 0

3 years ago

Read 2 more answers

How many mL of a 4% mass/volume Mg(NO3)2 solution would contain 1.2 grams of magnesium nitrate?

Phoenix [80]

4% mass / volume :

4 g ---------> 100 mL
1.2 g ------- ? mL

V = 1.2 * 100 / 4

V = 120 / 4

V = 30 mL

hope this helps!

7 0

3 years ago

I dont understand this question can u guys help

diamong [38]

Answer: B

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Explanation:

6 0

2 years ago

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A block has a mass of 25 grams and a volume of 24.5 cm3 what is the<br> density of the block?

schepotkina [342]

Answer:

<h3>The answer is 1.02 g/cm³</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass of block = 25 g

volume = 24.5 cm³

The density of the block is

$density = \frac{25}{24.5} \\ = 1.020408163...$

We have the final answer as

<h3>1.02 g/cm³</h3>

Hope this helps you

7 0

3 years ago