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lilavasa [31]
3 years ago
10

The mass number of an atom is obtained by totaling the number of _____ and _____.

Chemistry
2 answers:
son4ous [18]3 years ago
8 0
Mass number is the sum of protons and neutrons inside an atom.

Atomic mass = no. of protons + no. of neutrons
Alborosie3 years ago
4 0

the sum of protons and neutrons inside an atom is your answer


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The compound methyl butanoate smells like apples. Its percent composition is 58.8% C, 9.8% H, and 31.4% O, and its molar mass is
weeeeeb [17]
Let our basis for the calculation be 1 mol of the substance.
      (1 mol)(102 g/mol) = 102 g
Determine the amount of C, H, and O in mole.
          C = (102 g)(0.588)(1 mol/12 g) = 4.998 mols C
          H = (102 g)(0.098)(1 mol/1 g) = 9.996 mols H
          O = (102 g)(0.314)(1 mol/16 g) = 2 mols O

The empirical formula of the substance is C5H10O2. The molar mass of the empirical formula is 102. This means that this is also its molecular formula.

8 0
3 years ago
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when magnesium is burned in air the mass of the product is greater than the mass of the solid magnesium burned. A student claims
Nikitich [7]
Veg egverbygbe rbbnfghjufddfg
5 0
3 years ago
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Antimony has 2 naturally occurring isotopes. The mass of antimony-121 is 120.904 amu and the mass of antimony-123 is 122.904 amu
Sav [38]
Wow, now this one is a hard one, took me quite a while to figure it out but here it is:
120.904(x)+122.904(1-x)=121.76 \\ 
120.904x-122.904x+122.904=121.76 \\ 
-2x+122.904=121.76 \\ 
-2x=-1.144 \\ 
x=.572  \\ 
1-.572=.428
The abundances of the two isotopes is:
Antimony-121 = 57.2%
Antimony-123 = 42.8%
6 0
3 years ago
A scientist conducts an experiment to determine how the CO2 levels in ocean water affect the number of plants that can grow in t
Savatey [412]

Answer:

number of plants that grow in the ocean

Explanation:

<em>The dependent variable would be the number of plants that grow in the ocean.</em>

The dependent variable is the actual variable being measured in an experiment. The value of dependent variables is directly affected by another variable in an experiment - the independent variable. The latter is the manipulatable variable that is directly inputted during experiments.

In the illustration, the main aim of the experiment is to determine how CO2 levels in ocean water affect the number of plants that can grow in the ocean. The manipulatable input variable would be the CO2 while the outcome variable - the dependent variable - would be t<u>he number of plants that grow in the ocean.</u>

3 0
3 years ago
P
BARSIC [14]

5.426 x 10^{22} molecules are there in a deep breath of air whose volume is 2. 35 L at body temperature 36 C and a pressure of 740 torr.

Explanation:

Data given:

volume V = 2.35 L

Temperature T = 36 Degrees or 273.15 + 36 = 309.15 K

pressure P = 740 torr OR 0.973 Atm

R = 0.08205 L atm / mole K

n (number of molecules of gas)= ?

The formula used will be

PV = nRT

Putting the value of given variables in above equation:

n = \frac{PV}{RT}

 = \frac{0.973 x 2.35}{0.08205 x 309.15}

 = 0.0901 moles

According to Avagadro' s law that gases at equal volume, temperature and pressure contains same molecules.

number of molecules:

number of moles x avagadro number

0.0901 x 6.02 x 10^{23}

= 0.54 x 10^{23}

= 5.426 x 10^{22} molecules.

6 0
3 years ago
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