what mass of water is needed to completely react with 2.35g of Ca

To determine the mass of water needed to completely react with 2.35g of Ca, we need to know the balanced chemical equation for the reaction between Ca and water.

The balanced equation for the reaction between Ca and water is:

Ca + 2H2O -> Ca(OH)2 + H2

From the equation, we can see that 1 mole of Ca reacts with 2 moles of water to produce 1 mole of Ca(OH)2 and 1 mole of H2.

To find the mass of water, we need to convert the given mass of Ca into moles using its molar mass, and then use the mole ratio from the balanced equation to determine the moles of water.

The molar mass of Ca is approximately 40.08 g/mol.

Moles of Ca = Mass of Ca / Molar mass of Ca
Moles of Ca = 2.35 g / 40.08 g/mol
Moles of Ca = 0.0584 mol

According to the balanced equation, the mole ratio between Ca and H2O is 1:2, which means that 1 mole of Ca reacts with 2 moles of water.

Moles of water = Moles of Ca * (2 moles of water / 1 mole of Ca)
Moles of water = 0.0584 mol * 2
Moles of water = 0.1168 mol

Now, to find the mass of water, we multiply the moles of water by its molar mass.

Mass of water = Moles of water * Molar mass of water
Mass of water = 0.1168 mol * 18.02 g/mol
Mass of water = 2.104 g

Therefore, the mass of water needed to completely react with 2.35g of Ca is approximately 2.104g.

To calculate the mass of water needed to completely react with 2.35g of Ca, we need to determine the balanced chemical equation for the reaction between Ca and water. Let's assume the reaction is:

Ca + H2O -> Ca(OH)2 + H2

From the balanced equation, we can see that 1 mole of Ca reacts with 1 mole of water to produce 1 mole of Ca(OH)2 and 1 mole of H2.

1 mole of Ca has a molar mass of 40.08 g.
So, 2.35 g of Ca is equal to 2.35 g / 40.08 g/mol = 0.0585 moles of Ca.

Since the molar ratio between Ca and H2O is 1:1, we need 0.0585 moles of water to react with 2.35g of Ca.

The molar mass of water (H2O) is 18.02 g/mol.

Therefore, the mass of water needed is:
0.0585 moles x 18.02 g/mol = 1.054 g

So, 1.054 grams of water is needed to completely react with 2.35g of Ca.

Write the balanced equation.

Convert 2.35 g Ca to moles. moles = grams/molar mass.
Using the coefficients in the balanced equation, convert moles Ca to moles H2O.
Convert moles water to grams water. moles x molar mass = grams.
Post your work if you get stuck.