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Dmitry_Shevchenko [17]
3 years ago
9

What substances are in H2CO3(aq) H2O(I) + CO2(g)

Chemistry
1 answer:
blsea [12.9K]3 years ago
4 0

Answer:

In H2CO3(aq) + H2O(l) + CO2(g) there are:

4 hydrogen atoms

2 carbon atoms

6 oxygen atoms

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1) Balanced equation

C3H8 + 5O2 -> 3 CO2 + 4 H2O

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Given the pressure and temperature do not change, the molar ratio is equivalent to volume ratio

1molC3H8 / 5 mol O2 => 1 L C3H8 / 5 L O2

0.700 L C3H8 / x L O2 = 1 L C3H8 / 5 L O2 => x = 0.700 L C3H8 * 5 L O2 / 1 L C3H8

x = 3.500 L O2

3) CO2 produced

1 L C3H8 / 3 L CO2 = 0.700 L C3H8 / x L CO2 =>

x = 0.700 L C3H8 * 3 L CO2 / 1 L C3H8 = 2.100 L CO2

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The half life of a new isotope found on Mars is 2 years. It takes 10 years to get the sample back to Earth. If the astronauts st
yawa3891 [41]

Answer:

3.99 g

Explanation:

The following data were obtained from the question:

Half life (t½) = 2 years.

Original amount (N₀) = 128 g

Time (t) = 10 years

Amount remaining (N) =..?

Next, we shall determine the rate of disintegration of the isotope. This can be obtained as follow:

Half life (t½) = 2 years.

Decay constant (K) =.?

K= 0.693/t½

K = 0.693/2

K = 0.3465 year¯¹.

Finally, we shall determine the amount remaining after 10 years i.e the amount remaining when they arrive on Earth. This can be obtained as follow:

Original amount (N₀) = 128 g

Time (t) = 10 years

Decay constant (K) = 0.3465 year¯¹.

Amount remaining (N) =..?

Log (N₀/N) = kt/2.3

Log (128/N) = (0.3465 × 10)/2.3

Log (128/N) = 1.5065

Take the antilog of 1.5065

128/N = Antilog (1.5065)

128/N = 32.1

Cross multiply

128 = 32.1 × N

Divide both side by 32.1

N = 128/32.1

N = 3.99 g

Therefore, the amount remaining is 3.99 g

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