Which of the following is NOT an example of proxy data?

Chemistry

1 answer:

Tomtit [17]3 years ago

8 0

Answer:

itz e

Explanation:

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A student mixes a 10.0 ml sample of 1.0 m naoh(aq) with a 10.0 ml sample of 1.0 m hcl(aq) in a polystyrene container. the temper

AleksAgata [21]

Hrxn = Q reaction / mol of reaction
mol of reaction = M * V = 10 * 1 = 10 mmol = 0.01 mol
Q water = m * C * (Tf - Ti)
= (10 + 10) (4.184) (26-20) = 502.08 J
Q reaction = - Q water = -502.08 J
Hrxn = -502.08 / (0.01) = - 50208 J = - 50.21 kJ/mol

5 0

3 years ago

A 5.00 gram sample of an oxide of lead PbxOy contains 4.33 g of lead. Determine simplest formula for the compund

Harrizon [31]

Answer: The empirical formula is $PbO_2$

Explanation:

Mass of Pb = 4.33 g

Mass of O = (5.00-4.33) g = 0.67 g

Step 1 : convert given masses into moles

Moles of Pb = $\frac{\text{ given mass of Pb}}{\text{ molar mass of Pb}}= \frac{4.33g}{207g/mole}=0.021moles$

Moles of O = $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{0.67g}{16g/mole}=0.042moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Pb = $\frac{0.021}{0.021}=1$

For O = $\frac{0.042}{0.021}=2$

The ratio of Pb O= 1: 2

Hence the empirical formula is $PbO_2$

6 0

3 years ago

Consider the equation for the formation of water. 2h2 o2 right arrow. 2h2o what is the theoretical yield of h2o if 130 g of h2o

Montano1993 [528]

The theoretical yield is the reaction yield that measures the product of the reaction from the conversion of the limiting reagent. The theoretical yield is 160 gm.

Mass or the theoretical yield is the result of the multiplication of mole and the molar mass of the compound.

The reaction between hydrogen and oxygen is shown as,

$\rm 2H_{2} + O_{2} \rightarrow 2H_{2}O$