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zheka24 [161]
3 years ago
5

NEED ANSWER ASAP

Chemistry
2 answers:
Oksana_A [137]3 years ago
8 0
I think it is A (10 %)
krek1111 [17]3 years ago
3 0
A. 10% is the answer.
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C3H8 + 5 O2 → 3 CO2 + 4 H2O<br> What is the number of atoms on each side of the equation?
Roman55 [17]

Answer: 1.2642*10²⁵ on both sides

Explanation:

First check how many moles are there on each side.
Since this is a balanaced equataion the number of moles on each side is the same thus the number of atoms is also same on both sides

There are 3 moles of carbon and 8 moles of hydrogen in C3H8
and 2 moles of oxygen in O2 but there 5 infront so 2*5 is 10
Number of moles on the right is 10+8+3 = 21

Now use Avogrado's constant

21 Moles* (6.02*10²³)/Mol
= 21*6.02*10²³

= 1.2642*10²⁵

6 0
2 years ago
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How many grams of O2(g) are needed to completely burn 15.6 g of C3H8(g)?
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15.6gC3H8*44.1gC3H8*32gO2=11.32
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3 years ago
How many moles of atoms are contained in 15.7 g of Bromine
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15.7 g / 79.9 g = 0.196 moles of atoms
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3 years ago
3. What do you notice about the temperature of the substance in the test tube after it is placed in the beaker of water?
34kurt

Answer:

C: The temperature of the substance increases as it sits in the beaker of water

Explanation:

This question was taken from a video where an attempt was made to investigate the changes in temperature when a substance undergoes change from it's solid phase to its liquid phase.

To do this, as seen in the video online, it shows a solid substance in a test tube being placed in a beaker of water.

From observation, the water in the beaker has a warmer temperature than the solid substance present in the test tube and this in turn makes the test tube gradually increase in temperature.

Thus, the solid substance will as well increase increase in temperature when it is placed in the beaker of water.

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Explanation:

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3 years ago
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