<span>1. Calculate the mass of the formula unit (fu). Na= 22.990 g/mol Cl= 35.453 g/mol so total = 22.990 g/mol + 35.453 g/mol = 58.443 g/mol
1 mol = 6.02 x10^23 formula units, so (58.443 g/mol)*(1 mol/6.02x10^23 fu)= 9.7x10^-23
2. Convert mass to grams: (0.17 mg)*(1 g/1000 mg) = 0.00017 g
3. Calculate number of formula units: 0.00017 g x (1 fu/9.7x10^-23 g) = 1.8x10^18
Or more simply:
(.00017 g) * (1 mol/58.443 g) * (6.02x10^23 fu/1mol) = 1.8x10^18</span>
Answer:
Carcinogens are difficult to identify because there may be a long lag time between exposure to the agent and the detectable onset of cancer
Explanation:
quizlet.com/193673418/environmental-chapter-9-flash-cards/
Answer:
FeSO₄ is the Limiting Reactant
Explanation:
3FeSO₄(aq) + 2(NH₄)₃PO₄ (aq) => 3(NH₄)₃PO₄(aq) + Fe₃(PO₄)(s)
315ml(1.25M)FeSO₄ + 405ml(0.95M)(NH₄)₃PO₄
=> 0.315L(1.25M)FeSO₄ + 0.405ml(0.95M)(NH₄)PO₄
=> 0.394mole FeSO₄ + 0.385mole (NH₄)PO₄
Divide by respective coefficient => the smaller value is the Limiting Reactant.
=> 0.394/3 = 0.131 => 0.385/2 = 0.193
Smaller value is associated with FeSO₄
∴the limiting reactant is FeSO₄.
Summery:
1. convert reactant quantities to moles
2. divide reactants by respective coefficients of balanced equation
3. note smaller value after dividing by respective coefficient => Limiting Reactant.
Answer:
One way is through fossil fuels. When people burn fossil fuels it enters the atmosphere as carbon dioxide gas. Another way is through animals. Most animals exhale carbon dioxide as a waste product which gets into the atmosphere.
