Hello! Can you retake the photo
There are 14.4 * 10^18 oxygen atoms in 5.0020 mg of strontium bicarbonate.
Mass of strontium bicarbonate Sr(HCO3)2 = 5.0020 mg
Molar mass of strontium bicarbonate Sr(HCO3)2 = 209.6537 g/mol
Number of moles of strontium bicarbonate Sr(HCO3)2 = 5.0020 * 10^-3g/209.6537 g/mol
= moles
Given that we have 6 oxygen atoms per molecule of Sr(HCO3)2, the total number of oxygen atoms in Sr(HCO3)2 becomes;
Learn more: brainly.com/question/9743981
Answer:
every atom has no overall charge. because they contain equal numbers of positive protons and negative electrons. they cancel each other out making them a neutral atom.
Answer:
ΔT = 98.84 °C
Explanation:
Given data:
Heat absorbed = 255 J
Mass of gold = 20.0 g
Specific heat capacity of gold = 0.129 J/g.°C
Temperature change = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
by putting values,
255 J = 20.0 g × 0.129 J/g.°C × ΔT
255 J = 2.58 J / °C × ΔT
ΔT = 255 J / 2.58 J / °C
ΔT = 98.84 °C