Molecular Mass

The volume is 2,67 L.

11 g hydrogen are needed.

PtO2 is ionic

The answer is 2,7 moles.

The mass of a glass of soda overnight would remain relatively constant if it is covered and no significant evaporation occurs. However, if left uncovered, some carbonation may escape, leading to a slight reduction in mass due to gas loss. Additionally, if ice is present, its melting could maintain the mass initially, but overall, the mass change would be minimal.

The answer is 2 moles.

You can use the equationPV=nRT. So there are 0.12231 moles inthat volume.

That the average mass of an orange

(2.7 mol Ca / 1) * (40.078 g Ca / 1 mol Ca) = 108.21 g Ca.

After significant figures, the answer is 110 g Ca.

209 g of magnesium silicate is equivalent to 1,91 moles.

0,040 moles Zn equal 2,614 g.

The ideal gas law: PV=nRT

Where n=the number of moles

The volume is doubled.

6,49 moles of water are obtained.

The answer is 699 moles perchloric acid.

This molarity is 1,59.

The answer is 5,978 moles.

233,2 g iron Feis equivalent to 4,176 moles.

Mol is an official unit of concentration in SI, not of mass.
The transformation of a concentration expressed in mass per volume in a concentration in moles is at your choice.

The solution is 0,25 M.

1 liter of (liquid) water contains 55.5 moles.

Only one mole

Mole is the molecular weight of a compound in grams.
Mass is the mass of the solute dissolved in the solution.
Molar concentration is the number of moles of the solute in the unit of volume of the solution.
Volume is expressed in a unit of SI.

400 grams of nickel sulphate (anhydrous) is equivalent to 2,58 moles.

3,99 moles of Kr have 334,35 g.