The atomic number of an atom containing 29 protons, 29 electrons, and 34 neutrons is 29.
The atomic number of copper is 29, and it has a mass number of 63. The mass number is generally equal to the sum of the protons as well as neutrons within the nucleus, while the atomic number refers to the count of the nucleus's protons. This indicates that the nucleus of the copper atom contains 34 neutrons as well as 29 protons, for a total of 63 protons.
The charge number of such an atomic nucleus would be the chemical element's atomic number, also known as the nuclear charge number. This is equivalent to the proton number, or even the quantity of protons present in the nucleus of each atom of a particular element, for conventional nuclei.
Therefore, the atomic number of an atom containing 29 protons, 29 electrons, and 34 neutrons is 29.
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The balanced reaction would be as follows:
<span>3NaOH + H3PO4 --> Na3PO4 + 3H20
We are given the concentration and the amount of the reactants to be used. We use these values for the calculations as follows:
</span><span>How many mL of .225 M NaOH will react with 4.568g H3PO4?
4.568 g (1 mol / 98 g) ( 3 mol NaOH / 1 mol H3PO4 ) ( 1 L / .225 mol NaOH ) = 0.621 L or 621 mL of .225 NaOH</span>
Answer:
We need 4.06 J to heat of 406.0 mg of cyclohexane
Explanation:
Step 1: Data given
Mass of cyclohexane = 406.0 mg = 0.406 grams
The initial temperature = 33.5 °C
The final temperature = 38.9 °C
The specific heat of cyclohexane = 1.85 J/g*K
Step 2: Calculate the energy required to heat
Q = m*c*ΔT
⇒ with m = the mass of cyclohexane = 0.406 grams
⇒ with c = the specific heat of cyclohexane = 1.85J/g*K
⇒ with ΔT = The change of temperature = T2 - T1 = 38.9 - 33.5 = 5.4
Q = 0.406 g * 1.85J/g*K * 5.40
Q = 4.06 J
We need 4.06 J to heat of 406.0 mg of cyclohexane
Answer:
Dmitri Mendeleev
used patterns to predict undiscovered
elements
Johann Wolfgang Dobereiner
created groups of three elements,
each based on similar properties
John Newlands
arranged elements according to their
atomic mass
Antoine Lavoisier,
divided elements into four categories
✓
Answer:
1.47 M
Explanation:
First we <u>convert 86.00 g of NaCl into moles of NaCl</u>, using the <em>molar mass of NaCl</em>:
- 86.00 g ÷ 58.44 g/mol = 1.472 mol NaCl
Then we <u>convert 1000 mL into liters:</u>
Finally we can <u>calculate the molarity of the solution</u>:
- Molarity = moles / liters
- 1.472 mol / 1.0 L = 1.472 M