Guys I really need help A neutral Barium atom (Ba) has an atomic mass = 142. Whi
ID: 836415 • Letter: G
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Guys I really need help
A neutral Barium atom (Ba) has an atomic mass = 142. Which description below fits this atom? 42 protons, 86 neutrons, 42 electorns 56 protons, 86 neutrons, 56 electrons 56 protons, 86 neutrons, 54 electorns 56 protons, 142 neutrons, 56 electrons 56 protons, 142 neutorns, 54 electrons The atomic weight of silicon is 28.0855 u. How many silicon atoms are there in a 6.78 g sample of silicon? 1.46 Times 1022 atoms 1.69 Times 1025 atoms 3.94 Times 1024 atoms 1.46 Times 1023 atoms 8.01 Times 10-23 atoms This scientist proposed the idea that matter has wave properties Louis de Broglie Neils Bohr Weiner Heisenberg Albert Einstein Max Plank The mass of 4.07 moles of propanoic acid, C3H6O2, is correctly expressed as 1.23 Times 10-21 g 301 g 15.7 g 348 g 2.83 Times 1023 g A compound contains potassium, nitrogen, and oxygen. The experimental analysis gave values of 45.94% potassium and 16.46% nitrogen, by weight, the remainder is oxygen. What is the empirical formula of the compound? KNO2 KNO K3N2O2 K2N3O6 K3N2OExplanation / Answer
4) B
5) D
6) A
7) B
8) A
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