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mezya [45]
4 years ago
5

Four nails have a total mass of 4.42 grams how many moles of iron atoms do they contain

Chemistry
1 answer:
deff fn [24]4 years ago
5 0

Answer:4.42 g= 1 mol/55.845 =.079 moles of Fe

Explanation:Given 4.42 grams of Fe. The atomic weight of Fe(iron) found on the periodic table is 55.845. Divide grams by the atomic weight to convert to moles.

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A student measures the mass of a substance as 1.7132 kg and it’s volume as 0.65 L. What is the density of the substance in g/mL?
7nadin3 [17]

Answer:

\rho =2.6g/mL

Explanation:

Hello,

In this case, considering that the density is defined as:

\rho =\frac{m}{V}

Thus, since 1 kg equals 1000 g and 1 L equal 1000 mL, the required density in g/mL turns out:

\rho =\frac{1.7132kg}{0.65L}*\frac{1000g}{1kg}*\frac{1L}{1000mL}   \\\\\rho=2.6g/mL

Take into account that since 0.65 L has two significant figures, the result is also shown with two significant figures.

Regards.

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3 years ago
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