Answer: 1.31
Explanation:
No.of moles = given no.of atoms/Avagadro number
= 7.91×10^23 / 6.022 x 10^23
= 1.31
therefore, no.of moles = 1.31
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Answer:
The answer to your question is below
Explanation:
Element Atomic number Atomic mass # proton # neutron # electron
Copper 29 64 29 35 29
Fluorine 9 19 9 10 9
Lead 82 207.2 82 125 82
Sodium 11 23 11 12 11
Nitrogen 7 14 7 7 7
47.- Atomic number, Atomic mass, number of protons, neutrons and electrons
48.- Element, atomic mass, number of protons, neutrons and electrons
49.- Element, atomic number, atomic mass, neutrons and electrons
50.- element, atomic number, atomic mass, protons and neutrons
51.- element, atomic number, protons, neutrons and electrons
Answer:
Because the compound has a formula of M2O, the number of valence electrons of M should be 1. Therefore, (1) Group 1 is the correct answer because elements in group 1 have 1 valence electron.
Explanation:
Answer:
E. Mass number
H. Ion
F. Isotopes
I hope you have a great day. I'm sorry that I didn't know C or I.
Answer:
0.0526mol
Explanation:
The chemical equation given in this equation is as follows:
Na3PO4 + Sr(NO3)2 → Sr3(PO4)2 + NaNO3
However, this equation is unbalanced as the number of atoms of each element on each side does not correlate. The balanced equation is as follows:
2Na3PO4 + 3Sr(NO3)2 → Sr3(PO4)2 + 6NaNO3
This balanced equation means that:
2 moles of Sodium Phosphate (Na3PO4) is required to react with 3 moles of Strontium Nitrate (Sr(NO3)2)
Hence, if 0.0789 moles of Strontium Nitrate are reacted, then 0.0789 × 2/3
moles of sodium phosphate will also react.
= 0.0789 × 2/3
= 0.1578/3
= 0.0526mol
