In figure 15-1, cool air is more dense and forces up air.
b^2 would not be b*2.
for a given reaction to take place, there might be at least one of these (7) signs;
- formation of gas bubbles, formation of a precipitate (creation of a solid from a solution), a change in color, a change in volume (due to change in density), a change in temperature (endothermic or exothermic), change in taste or smell and emission of light or fire..
2.923 × 10⁻²² g
we must convert molecules of co₂ to moles and then to grams of co₂.
step 1. convert molecules to moles
moles of co₂ = 4 molecules co₂ × (1 mol co₂/6.022 × 10²³ molecules co₂)
= 6.642 × 10⁻²⁴ mol co₂
step 2. convert moles to grams
mass of co₂ = 6.642 × 10⁻²⁴ mol co₂ × (44.01 g co₂/1 mol co₂)
= 2.923 × 10⁻²² g co₂
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