Answer:
Mass = 83.33 g
Explanation:
Given data:
Number of atoms of neon = 2.486×10²⁴
Mass of neon = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.486×10²⁴ × 1 mol / 6.022 × 10²³ atoms
0.413×10¹ mol
4.13 mol
Mass of neon:
Mass = number of moles × molar mass
Mass = 4.13 mol × 20.18 g/mol
Mass = 83.33 g
Mass of K = 39.1g/mole
Mass of H = 1g/mole
Mass of C = 12g/mole
Mass of O = 16g/mole
Mass of KHCO3 = 39.1 + 1 + 12 + 3*16 = 100,1g/mole
100% ------------ 100.1g of KHCO3
x% ----------------- 12g of C
x = 11,99% of C in KHCO3
100% -------------- 100.1 of KHCO3
y% --------------------3*16g of O
y = 47,95% of O in KHCO3
100% ------------- 100.1g of KHCO3
z% ---------------- 1g of H
z = 0,99% of H in KHCO3
11,99% + 47,95% + 0,99% = 60,93% ≈ 61%
<u>answer: C</u>
The answer should be D
Hope this helps
~ Jordan ~
Answer:
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