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valentinak56 [21]
3 years ago
6

Please help!! Will name brainliest!! Lots of points. Please I need really quick!! I'd really appreciate it

Chemistry
1 answer:
zimovet [89]3 years ago
3 0

Answer:

.384

Explanation:

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Question 30
cestrela7 [59]

well #1 is A

and #2 is E  

well i did just do this


4 0
3 years ago
Read 2 more answers
The molar mass of carbon dioxide is 44.0 g/mol. How many moles of CO2 are present in a 58.4 gram sample of CO2
inessss [21]

Answer:

1.33 moles CO2

Explanation:

The number you are converting is 58.4 g CO2, so you start with this value. The conversion factor is 44.0 g/mol CO2. In order to cross out the grams, the grams must go on the bottom of the conversion factor.

                                  1   mol CO2      
58.4 g CO2   x   --------------------------    =    1.33 moles CO2
                              44.0   grams

The answer has three sig figs.

3 0
2 years ago
An igneous rock originally has 3 grams of uranium 238 in it. When dated the rock only contains 1.8 grams. What are the parent an
castortr0y [4]

Answer :

The parent and daughter concentrations (in percentages) is, 60 % and 40 % respectively.

The age of rock is 3.32\times 10^9\text{ years}

Explanation :

First we have to calculate the parent and daughter concentrations (in percentages).

\text{Parent concentrations}=\frac{1.8g}{3g}\times 100=60\%

and,

\text{Daughter concentrations}=\frac{(3-1.8)g}{3g}\times 100=40\%

As we know that, the half-life of uranium-238 = 4.5\times 10^9 years

Now we have to calculate the rate constant, we use the formula :

k=\frac{0.693}{t_{1/2}}

k=\frac{0.693}{4.5\times 10^9\text{ years}}

k=1.54\times 10^{-10}\text{ years}^{-1}

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  = 1.54\times 10^{-10}\text{ years}^{-1}

t = time passed by the sample  = ?

a = initial amount of the reactant  = 3 g

a - x = amount left after decay process = 1.8 g

Now put all the given values in above equation, we get

t=\frac{2.303}{1.54\times 10^{-10}}\log\frac{3}{1.8}

t=3.32\times 10^9\text{ years}

Therefore, the age of rock is 3.32\times 10^9\text{ years}

5 0
3 years ago
X-rays with a wavelength of 8.82 nm. Calculate the frequency of the x rays
krok68 [10]

Answer:

The wave with the wavelength of 8.82 nm have frequency of 0.340 × 10¹⁷ s⁻¹.

Explanation:

Given data:

Wavelength of x-ray = 8.82 nm

frequency of x-ray = ?

Solution:

speed = Wavelength × frequency

frequency = speed /  Wavelength

c = 3 × 10⁸ m/s

f = c/ λ

f = 3 × 10⁸ m/s /8.82 × 10⁻⁹m

f = 0.340 × 10¹⁷ s⁻¹

The wave with the wavelength of 8.82 nm have frequency of 0.340 × 10¹⁷ s⁻¹.

6 0
3 years ago
Antimony is burned in oxygen to form antimony oxide.
Zinaida [17]

The number of mole of S₂O₃ produced from the reaction is 13.33 moles

<h3>Balanced equation </h3>

4Sb + 3O₂ —> 2S₂O₃

From the balanced equation above,

3 moles of O₂ reacted to produce 2 moles of S₂O₃

<h3>How to determine the mole of S₂O₃ produced </h3>

From the balanced equation above,

3 moles of O₂ reacted to produce 2 moles of S₂O₃.

Therefore,

20 moles of O₂ will react to to produce = (20 × 2) / 3 = 13.33 moles of S₂O₃.

Thus, 13.33 moles of S₂O₃ were obtained from the reaction.

Learn more about stoichiometry:

brainly.com/question/14735801

6 0
2 years ago
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