3 years ago

How many moles are in 25 grams of iron ?

Chemistry

1 answer:

MakcuM [25]3 years ago

7 0

Answer: 0.45 mole Fe

Explanation: solution

25 g Fe x 1 mole Fe / 56 g Fe

= 0.45 mole Fe

Cancel out grams of Fe.

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If you have a graduated cylinder, containing 15.5 mL and this volume changes to 95.2 mL after a metal with a mass of 7.95g is dr

xxTIMURxx [149]

Answer: The density of the object will be $9.97\times 10^{-2}$ g/ml.

Explanation:

Density is defined as the mass contained per unit volume.

$Density=\frac{mass}{Volume}$

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Volume of water displaced = volume of the object = (95.2 - 15.5) ml =79.7 ml

Putting in the values we get:

$Density=\frac{7.95g}{79.7ml}=0.0997g/ml$

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Krypton gas is 21 times denser than helium gas at the same temperature and pressure. which gas is predicted to effuse faster

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