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Ber [7]
2 years ago
12

Epidemiological studies looks into:

Chemistry
1 answer:
Yanka [14]2 years ago
8 0

Answer:

It is used in medical research.

Explanation:

So its answer is trends in drug effectiveness

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Consider a solution containing .100 M fluoride ions and .126M hydrogen fluoride. The concentration of fluoride ions after the ad
S_A_V [24]
Given:

Concentration of Fluoride ions = 0.100 M
Concentration of Hydrogen Fluoride = 0.126 M

Asked: Concentration of fluoride ions after the addition of 5ml of 0.0100 M HCl to 25 mL of the solution

Assume: 50:50 ratio of fluoride ions and HF

12.5ml*0.1mol/L *1L/1000mL + 12.5*0.126mol/L * 1L/1000mL = 2.825x10^-3 moles F-

5ml * 0.01 mol/L *1L/1000mL = 5x10^-5 moles

Assume: Volume additive

Final concentration = 2.825x10^-3 + 5x10^-5 moles/ 30 ml * 1000ml/L =0.0958 M
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Look up the densities of the elements
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Heat flows naturally from objects that have higher energy to those with?
Vlad [161]

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heat flow

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heat flow moves to a higher temperature to a lower temperature

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.266 mol CO plus .524 Mol H2 gives how many moles of CH3OH
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Explanation:

Carbon monoxide and hydrogen gas reacts together to form methanol:

CO + 2H2 => CH3OH

Since 0.266mol * 2 = 0.532mol > 0.524mol, the limiting reactant here is hydrogen and therefore there will be 0.524mol / 2 = 0.262mol of methanol.

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