D. an ancient stone temple
A: 6 moles
You have to find the molar mass and then multiply
Answer:
The chronic daily intake during the period of exposure is most nearly 0.012 mg/kg day.
Explanation:
Number of hours worker exposed to xylene =
The concentration of xylene in the workplace =
The worker is inhaling air at a rate of .
Amount xylene inhaled by worker in an hour :
=
Amount xylene inhaled by worker in 320 hours:
1 μg = 0.001 mg
Amount xylene inhaled by worker in 320 hours = 11.520 mg
1 day = 24 hours
Amount xylene inhaled by worker in 1 day:
Assuming 70 kg body mass, the chronic daily intake of xylene :
The chronic daily intake during the period of exposure is most nearly 0.012 mg/kg day.
The scientific principle you're referring to here is the law of conservation of mass. The unbalanced equation would be:
C5H12 + O2 --> H2O + CO2
We need the same number of each atom on both sides for mass to be conserved. Start with C because it only appears once on both sides. We have 5 on the left, so we need 5 on the right:
C5H12 + O2 --> H2O + 5CO2
Now we can do the same with H. There are 12 on the left, but only 2 on the right:
C5H12 + O2 --> 6H2O + 5CO2
Finally we can balance the O's. There are 2 on the left, but 16 on the right. Your final balanced equation will be:
C5H12 + 8O2 --> 6H2O + 5CO2
Answer:
9 moles of NaNO3 is obtained
Explanation:
The balanced chemical reaction equation for the reaction is;
Al(NO3)3 + 3NaCl-------> 3NaNO3 + AlCl3
Now, we have to determine the limiting reactant. The limiting reactant yields the least amount of NaNO3.
1 mole of Al(NO3)3 yields 3 moles of NaNO3
4 moles of Al(NO3)3 yields 4 * 3/1 = 12 moles of NaNO3
Also,
3 moles of NaCl yields 3 moles of NaNO3
9 moles of NaCl yields 9 * 3/3 = 9 moles of NaNO3
Hence, NaCl is the limiting reactant and 9 moles of NaNO3 is obtained.