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iren [92.7K]
3 years ago
14

A chemist adds 135.0 mL of a 0.21M zinc nitrate (Zn(NO3) solution to a reaction flask. Calculate the mass in grams of zinc nitra

te the chemist has added to the flask. Be sure your answer has the correct number of significant digits.
Chemistry
1 answer:
yKpoI14uk [10]3 years ago
8 0

Answer:

5.36 grams the mass in grams of zinc nitrate the chemist has added to the flask.

Explanation:

Molarity=\frac{\text{Moles of solute}}{\text{Volume of the solution (L)}}

Moles of zinc nitrate = n

Volume of the solution = 135.0 mL = 0.1350 L

Molarity of the solution = 0.21 M

0.21 M=\frac{n}{0.1350 L}

n=0.21M\times 0.1350 L=0.02835 mol

Mass of 0.02835 moles of zinc nitrate:

0.02835 mol × 189 g/mol = 5.358 g ≈ 5.36 g

5.36 grams the mass in grams of zinc nitrate the chemist has added to the flask.

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Explanation:

i hope this help a little

4 0
2 years ago
Which of these statements about atomic models is most likely correct?
taurus [48]

Answer:

The correct option is the second option

Explanation:

Generally, the aim of science is to understand a particular concept in the best and the most correct way possible; hence experiments are done and repeated to ensure an explanation is actually true about a concept or need modification.

The atomic models have also been a "beneficiary" of this process. The different atomic models are usually been improved upon as scientists leaned more. For example, the Dalton's atomic theory has been modified to a more correct atomic description; some of which are shown below

(1) Dalton's theory suggested that an atom is the smallest unit of a molecule. We know now from different experiments (by J. J Thompson and Rutherford) that atoms are not the smallest molecules and are made up of smaller particles known as protons, neutrons and electrons.

(2) Dalton's theory suggested that atoms of the same elements are alike in all aspects. The knowledge of isotopy shows this is not always the case. As atoms of the same elements (isotopes) have the same atomic number but different mass number; hence cannot be said to be the same in all aspects.

(3) Dalton's theory also suggested that when atoms react, they do so in fixed, simple whole number ratio. The knowledge of organic chemistry shows atoms do not always react in simple whole number ratios

There are several modifications to different postulations by scientists that have also occurred aside from this, hence the most correct answer is that "As scientists learned more, they modified the atomic model"

5 0
3 years ago
How is the law of conservation of mass shown by a balanced chemical equation?
valina [46]

Answer:

Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.

Hope this helps! (:

7 0
3 years ago
Which statement best describes the variables in a controlled experiment?
AveGali [126]

Answer is: A. The independent variable is changed to see its effect on the dependent variable while all other conditions are unchanged.

The two main variables in an experiment are the independent and dependent variable.  

Dependent variable is the variable being tested and measured in a scientific experiment.  

Dependent variables depend on the values of independent variables. The dependent variables represent the output or outcome whose variation is being studied.  

6 0
3 years ago
Read 2 more answers
Calculate the energy required to heat 179g of ethanol from to . Assume the specific heat capacity of ethanol under these conditi
slava [35]

Answer:

9.52 × 10³ J

Explanation:

There is some info missing but I found it on the web.

<em>Calculate the energy required to heat 179g of ethanol from -2.2 °C to 19.6 °C. Assume the specific heat capacity of ethanol under these conditions is 2.44 J/g.°C. Be sure your answer has the correct number of significant digits.</em>

Step 1: Given data

  • Mass of ethanol (m): 179 g
  • Initial temperature: -2.2°C
  • Final temperature: 19.6 °C
  • Specific heat capacity of ethanol (c): 2.44 J/g.°C

Step 2: Calculate the temperature change

ΔT = 19.6 °C - (-2.2 °C) = 21.8 °C

Step 3: Calculate the energy required (Q)

We will use the following expression.

Q = c × m × ΔT

Q = 2.44 J/g.°C × 179 g × 21.8 °C

Q = 9.52 × 10³ J

6 0
2 years ago
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