Answer:
Mass of the substance, grams
86.8
Molar mass of the substance
18.0
Molar mass details
2.0160 H (2*1.008) + 15.9990 O (1*15.999)
Explanation:
Cu, Na and Nd are all elements.
A compound consists of at least 2 different elements.
Calcium chloride (CaCl2) consists of calcium and chlorine atoms, therefore it is a compound.
Answer:
0.010g of C-14 would be later after 50,000 years
Explanation:
The kinetics of radioactive decay follows the equation:
Ln (N / N₀) = -kt
<em>Where N could be taken as mass after time t, </em>
<em>N₀ initial mass = 4.30g;</em>
k is rate constant = ln 2 / t(1/2)
<em>= ln 2 / 5730years = 1.2097x10⁻⁴ years ⁻¹</em>
<em />
Replacing:
Ln (N / 4.30g) = -1.2097x10⁻⁴ years ⁻¹ * 50000 years
N / 4.30 = 2.36x10⁻³
N =
<h3>0.010g of C-14 would be later after 50,000 years</h3>
Answer:
1 and 4
Explanation:
in both pictures the temperature is cooling down