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natima [27]
3 years ago
8

( urgent help needed!! 50pts + brainliest )

Chemistry
2 answers:
Ivanshal [37]3 years ago
5 0

Answer:

Thorium-234 option a .......

Marizza181 [45]3 years ago
4 0

238 4 234

U --> α + Th

92 2 90

The answer is A Thorium.

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What is the volume in L of a 0.825 mole sample of Ar at 600 mm Hg and 300 K?
Natali5045456 [20]

Answer:

V = 25.7 L

Explanation:

To find the volume of Argon (Ar), you need to use the Ideal Gas Law equation. This looks like:

PV = nRT

In this formula,

        > P = pressure (atm)

        > V = volume (L)

        > n = number of moles

        > R = constant (0.0821 L*atm/K*mol)

        > T = temperature (K)

While there is a different constant that can be used if you want to keep the pressure in mmHg, there is a more common constant used when the pressure is in atm. So, to find the volume, you need to (1) convert mmHg to atm (by dividing by 760) and then (2) calculate the volume (using Ideal Gas Law).

<u>(Step 1)</u>

600 mm Hg              1 atm
-------------------  x  ---------------------  =  0.789 atm
                              760 mm Hg

<u>(Step 2)</u>

PV = nRT

(0.789 atm) x V = (0.825 mole)(0.0821 L*atm/K*mol)(300 K)

(0.789 atm) x V = 20.32

V = 25.7 L

5 0
2 years ago
A chromium oxide compound contains 104.0 grams of chromium and 48.0 grams of oxygen. What is the most likely empirical formula o
TEA [102]

Answer: Empirical formula of this compound is Cr_2O_3

Explanation:

Mass of Cr= 104.0 g

Mass of O = 48.0 g

Step 1 : convert given masses into moles.

Moles of Cr =\frac{\text{ given mass of Cr}}{\text{ molar mass of Cr}}= \frac{104.0g}{52g/mole}=2moles

Moles of O =\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{48.0g}{16g/mole}=3moles

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Cr = \frac{2}{2}=1

For O =\frac{3}{2}=1.5

Converting into simple whole number ratios by multiplying by 2

The ratio of Cr : O= 2: 3

Hence the empirical formula is Cr_2O_3

The most likely empirical formula of this compound is Cr_2O_3

4 0
3 years ago
How many microliters are there in a volume of 370 mm 3of cobra venom?
Hunter-Best [27]

3700 microL is the answer

Hope it was correct :)

5 0
3 years ago
A new element X is found and in the sample 70% has a mass number of 43, 25% is X-44, &amp; 5% is X-47. What is the (average) ato
Semenov [28]

The average atomic mass of this new element X is 43.45

HOW TO CALCULATE AVERAGE ATOMIC MASS:

  • The average atomic mass of an element can be calculated by the following steps:

  1. multiplying the atomic mass of each isotope with its relative abundance
  2. Then sum the results for each isotope

According to this question; a new element X is found and in the sample:

  1. 70% is X-43
  2. 25% is X-44
  3. 5% is X-47

The average atomic mass of element X is calculated thus:

X-43: 70/100 × 43 = 30.1

X-44: 25/100 × 44 = 11

X-47: 5/100 × 47 = 2.35

Next, we sum the results as follows:

= 30.1 + 11 + 2.35

= 43.45

  • Therefore, the average atomic mass of this new element X is 43.45.

Learn more: brainly.com/question/13753702?referrer=searchResults

6 0
3 years ago
Experiment you could do to measure the speed of sound in water
IrinaVladis [17]

Answer:

You can use a sound velocity probe

7 0
3 years ago
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