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scoray [572]
3 years ago
10

Hello it's my new id myself numu ​

Chemistry
2 answers:
zavuch27 [327]3 years ago
7 0

Answer:

Hi numu !

How are you .

:D

Hope you have nice time

zaharov [31]3 years ago
3 0

Answer:

Hi numu I'm Tanvi

Explanation:

how r u?

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Burning wood represents a chemical change.<br> True or False?
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True
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3 years ago
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Consider 2H2 + O2 → 2H2O. To produce 1.2 g water, how many grams of H2 are required? Report to the correct number of significant
Elden [556K]

Answer:

0.133 mol (corrected to 3 sig.fig)

Explanation:

Take the atomic mass of H=1.0, and O=16.0,

no. of moles = mass / molar mass

so no. of moles of H2O produced = 1.2 / (1.0x2+16.0)

= 0.0666666 mol

From the equation, the mole ratio of H2:H2O = 2:2 = 1:1,

meaning every 1 mole of H2 reacted gives out 1 mole of water.

So, the no, of moles of H2 required should equal to the no, of moles of H2O produced, which is also  0.0666666 moles.

mass = no. of moles x molar mass

hence,

mass of H2 required = 0.066666666 x (1.0x2)

= 0.133 mol (corrected to 3 sig.fig)

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3 years ago
Which of the following is true about tissues and organs?
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A solid is crushed into a powder is chimacal change or pysical change
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A solid being crushed into a powder is a physical change because a chemical change is when substances combine to create new substances.

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