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4 years ago

Element M has two isotopes,^104M and ^106M.

1 answer:

3 0

To calculate atomic mass, you have to take to weighted average of the isotopes' masses. What that means is M = RA*106 + (1 – RA)*104, where RA is relative abundance expressed in decimal form. If you simplify the right side of that equation, you get M = 2*RA + 104. Doing a little more algebra yields RA = (M –104)/2 = (104.4 – 104)/2 = 0.4 / 2 = 0.2, which is 20%. So the answer is B.

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Osmium 76 atom have many neutrons

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4 years ago

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Given the following equation: CH4 + 202 CO2 + 2H2O

trapecia [35]

Answer:

Mass = 0.8 g

Explanation:

Given data:

Mass of oxygen = 3.2 g

Mass of CH₄ = ?

Solution:

Chemical equation:

CH₄ + 2O₂ → CO₂ + 2H₂O

Number of moles of O₂:

Number of moles = mass/molar mass

Number of moles = 3.2 g/ 32 g/mol

Number of moles = 0.1 mol

Now we will compare the moles of CH₄ and O₂.

O₂ : CH₄

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Mass of CH₄:

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Mass = 0.05 mol × 16 g/mol

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3 years ago

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Pharmacists sometimes measure medicines in the unit of "grains," where 1 gr = 65 mg. The label on a bottle of aspirin reads "Asp

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Answer:

325mg of Aspririn

Explanation:

First you should note the information that the problem gives you:

- The bottle of Aspirin has 5gr (grains)

- 1gr(grain) = 65mg (miligrams)

Also, the problem is asking about how many aspirin are in 5 gr (grains), so you should use a conversion factor, as follows:

-First you should put the quantity you need to convert:

$5grAspirin$

-Then you write the denominator of the conversion factor that must have the same units that you want to convert, in this case gr:

$5grAspirin*\frac{}{1grAspirin}$

-Then you write the numerator with the units that you want to obtain and the numerical equivalence between the units, in this case:

$5grAspirin*\frac{65mgAspririn}{1grAspirin}$

-Finally you multiply numerators and divide by denominators:

$5grAspirin*\frac{65mgAspririn}{1grAspirin}=325mgAspririn$

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4 years ago

Magtala ng limang (5) pamamaraan kung paano huhubugin ang konsiyensiya ng tao upang kumiling ito sa mabuti at hindi sa masama

Sergeu [11.5K]

Answer:

Siguraduhin na ang mga pagpapasya mo ay may tamang gabay.
Iwasan ang manghusga sa kapwa.
Huwag gumawa ng masama sa sarili, sa kapwa o kahit kanino pa
Huwag pakinggan ang mga sinasabi nila na nakakapagpababa sayo, dapat ay ipagpatuloy lang ang nais na gawin ng iyong sarili hangga't alam mo sa sarili mo na tama ang iyong ginagawa
Huwag gayahin ang mga maling nakikita sa paligid

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3 years ago

Balance the chemical equation by indicating the number of each species in the appropriate blanks. For this exercise, indicate co

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Answer:

3 Fe (s) + 4 H2O (l) -----> Fe3O4 (s) + 4 H2 (g)

Explanation:

your question is not completed , perhaps the question is similar to this solution, you can use it .

The balanced equation is

3 Fe (s) + 4 H2O (l) -----> Fe3O4 (s) + 4 H2 (g)

Explanation: In order to balance an equation we must ensure that the number of atoms of each species on right side of the arrow must be equal to the number of atoms of each species on left side of the arrow.

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