Biology, 17.07.2019 22:30 lizzy6629

4.8g of calcium is added to 3.6g of water. the following reaction occurs ca + 2h2o  ca(oh)2 + h2 i. the number of moles of calcium = ii. the number of moles of water = iii. which reagent is in excess? explain your choice. iv. calculate the mass of the reagent named in (ii) which remained at the end of the experiment.

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Reaction of interest is: Ca + 2H2O ↔ Ca(OH)2 + H2

Answer 1:
Number of moles of calcium = $\frac{\text{weight of Ca (g)}}{\text{Atomic Weight}}$

Atomic weight of Ca = 40.078 g/mol

Therefore, Number of moles of calcium = $\frac{\text{4.8}}{\text{40.078}}$
= 0.1198.

Number of moles of Ca = 0.1198.
....................................................................................................................

Answer 2:
Number of moles of water = $\frac{\text{weight of H2O (g)}}{\text{Molecular Weight}}$

Molecular weight of H2O = 18 g/mol

Therefore, Number of moles of water = $\frac{\text{3.6}}{\text{18}}$
= 0.2.

Number of moles of water = 0.2.
......................................................................................................................

Answer 3:
Number of moles of water = 0.2
Number of moles of Ca = 0.1198

Here it can be seen that, Number of moles of water > Number of moles of Ca.
Hence, water is in excess.
.........................................................................................................................

Answer 4:
Number of moles of water that is in excess = 0.2 - 0.1198
= 0.0802

We know that, 1 mole of water ≡ 18 g of water
Therefore, 0.0802 mole of water ≡ 1.4436 g of water.

Thus, 1.4436 g of water is excess in the experiment.

Answer from: Quest

21 stacks

step-by-step explanation:

divide 630/30

21 stacks

enjoy!

Answer from: Quest

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.

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4.8g of calcium is added to 3.6g of water. the following reaction occurs ca + 2h2o  ca(oh)2 + h2 i....

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