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Sedbober [7]
4 years ago
12

A substance was analyzed in a laboratory. It was composed of three elements in a fixed ratio. The substance is an ?

Chemistry
2 answers:
Monica [59]4 years ago
5 0

Explanation:

A compound is defined as the substance which contains different type of elements that chemically combine together in a fixed ratio by mass.

For example, CaCl_{2} is a compound as it contains calcium and chlorine which are different elements. And, both Ca and Cl are combining in 1:2 ratio.

And, for every molecule of calcium chloride these elements will always be present in 1:2 ratio.

Thus, we can conclude that when a substance was analyzed in a laboratory. It was composed of three elements in a fixed ratio. The substance is a compound.

Julli [10]4 years ago
3 0
The element strontium (atomic number = 38) has four naturally-occurring isotopes. They are: Isotope / Percent Abundance / Mass (amu) Sr-84 / 0.56% / 83.9134 Sr-86 / 9.86% / 85.9093 Sr-87 / 7.00% / 86.9089 Sr-88 / 82.58% / 87.9056 The first thing to do is to convert all of the percentages to decimal fractions. To do that just move the decimal point two places to the left. Be careful, though...if the decimal is already at the front of the number you STILL have to move it two places. Add leading zeroes as necessary. 0.56% becomes 0.0056 9.86% becomes 0.0986 7.00% becomes 0.0700 82.58% becomes 0.8258 Next multiply each of the decimal fractions by the mass of each isotope. 0.0056 x 83.9134 = 0.47 0.0986 x 85.9093 = 8.47 0.0700 x 86.9089 = 6.08 0.8258 x 87.9056 = 72.59 Finally add the results to find the average atomic mass. 0.47 + 8.47 + 6.08 + 72.59 = 87.61 amu This agrees closely with the listed atomic mass for strontium, so I know I probably did my work correctly. I hope that helps
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3 0
3 years ago
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Calculate the mass of 120cc of nitrogen at stp .how many numbers of molecules are prrsent
Ratling [72]

Answer:

3.2 x 10²¹molecules

Explanation:

Given parameters:

Volume of nitrogen gas = 120cm³

Unknown:

Mass of nitrogen gas = ?

Number of molecules  = ?

Solution:

To solve this problem, note that;

   1 mole of gas occupies a volume of 22.4L at STP

  Now;

   convert 120cm³ to L ;

           1000cm³  = 1L

           120cm³ gives 0.12L

    Since;

            22.4L of gas has 1 mole at STP

            0.12L of gas will have \frac{0.12}{22.4}   = 0.0054mole at STP

So;

    Mass of N₂  = number of moles x molar mass

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    Mass of N₂  = 0.0054 x 28  = 0.15g

Now;

        1 mole of a gas will have 6.02  x  10²³ molecules

      0.0054 mole of N₂ will contain   0.0054 x  6.02  x  10²³ =

                          3.2 x 10²¹molecules

8 0
3 years ago
What is a responding variable
kondaur [170]

Answer:

A manipulated variable is also called an independent variable. A responding variable is a variable that the researcher predicts will change if the manipulated variable changes. A responding variable is also called a dependent variable.

5 0
3 years ago
Valence electrons are important when drawing molecular structures because
My name is Ann [436]

Answer:

d

Explanation:

Valence electrons are in the outermost shell. They form chemical bonds with other elements, not any other electrons. Hope this helps!

7 0
3 years ago
Calculate the number of moles in 200 grams of Sodium hydroxide​
TEA [102]

Answer:

The answer is 5 mol

Explanation:

Number Of Moles = Mass Of Substance ÷ Mass Of One Mole

Mass of NaOH = Molar Mass of Sodium + Oxygen + Hydrogen

23 + 16 + 1

40 g/mol

Number of Mole = 200/40 = 5 mol

Thus, The number of Moles in 200 grams of Sodium hydroxide is 5 mol

<u>-TheUnknownScientist 72</u>

6 0
3 years ago
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