Chemistry
Molecular Mass

# How many grams of oxygen will in 2 moles of potassium dichromate?

Structure for this is K2Cr2O7. there are 14 moles of O in 2 moles.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many grams are in 0.75 moles of water?

Molar mass of water is 18gmol-1. so there are 13.5 grams.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# What is the mass of 3.8 moles of Na?

Sodium is a metal element. Mass of 3.8 moles is 87.4g.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many moles of sodium hydroxide will be produced from the complete reaction of 15.0 g sodium?

Sodium reacts with water. 0.652 NaOH moles will form.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# What is the mass of 7 moles of strontium?

7 moles of strontium is equal to 613,34 g.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many moles of aluminum are in 10.8 grams?

10,8 g aluminium is equivalent to 0,4 moles.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many moles of CO are produced from 5 moles o2?

The answer is 10 moles of carbon monoxide.
2 C + O2 = 2 CO

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many moles of HCl are needed to react 2.4 moles of Al?

This reaction emmits H2 gas. We need 7.2 moles of Hcl.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many moles of HCl and needed to react 2.4 moles of Al?

Al+HCl===> AlCl3+H2 Is the reaction. You need &.2 moles of HCl.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# According to the ideal gas laws what happens to the volume of a gas when the number of moles doubles?

The product PV remain constant in a closed system at constant temperature.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many moles are in 750 L of hydrogen gas?

750 L hydrogen gas at 0 0C and 1 at is equal to 33,44 moles.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How do we get moles from mass?

Calculate:

mass/molar mass = moles

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many moles of CC14 are present in 56g?

This is carbon tetra chloride. there are 0.3636 moles in this mass.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many moles are in 45g of F?

45 g is equal to 1,184 moles fluorine.

Chemistry
Molecular Mass

# How many moles in 20 grams of Na2CO3?

20 g anhydrous sodium carbonate is equivalent to 0,188 moles.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# What form of the ideal gas law would you use to calculate the number of moles?

This is the general law of gases:
PV = nRT (n is the number of moles)

Chemistry
Atoms and Atomic Structure
Molecular Mass

# What is the pressure of 4 moles of helium in a 50l tank at 308 K?

The pressure is approx. 2 atmospheres.

Elements and Compounds
Molecular Mass

# What is the molecular mass for MgO?

When there is only one atomic symbol shown for each element in the formula of a compound, as with MgO, the molecular mass is simply the sum of the gramatomic masses, in this instance, 40.304 grams.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many moles of hydrogen are in C2H6?

Ethane contain 20 % hydrogen.

Chemistry
Atoms and Atomic Structure
Molecular Mass

# What volume of hydrogen in L is produced from the complete reaction of 3.143 moles of hydrogen chloride with magnesium at STP Mg s 2 HCl aq MgCl2 aq H2 g?

The reaction is 2HCl(aq) + Mg(s) ==> MgCl2(aq) + H2(g)
3.143 moles HCl will yield 1/2 x 3.143 moles of H2 gas (see balanced equation stoichiometry)
Thus, 3.143 moles/2 = 1.5715 moles H2 gas will be produced
At STP 1 mole - 22.4 liters, thus 1.5715 moles x 22.4 L/mole = 35.20 liters of H2 gas formed

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many moles of KF are contained in 347 g of water in a 0.175 m KF solution?

The definition of 0.175 m KF is that 1 kg of water contains 0.175 moles of KF. Thus, 347 g of water is equivalent to 0.347 kg, and to find moles of KF, you calculate as follows:
0.175 moles/Kg x 0.347 kg = 0.0607 moles of KF are present (3 significant figures).

Chemistry
Atoms and Atomic Structure
Molecular Mass

# How many moles of gold Au are in 3.60X10-5 of gold?

If 3,6 x 10-5 is grams the number of atoms is 1,1.10e17.

Units of Measure
Physics
Chemistry
Molecular Mass

# Does gas have mass and density?

The short answer is yes, gas has mass and density. However, you should note that gas is a state of matter, just as solid and liquid are. Since all matter has mass, any substance in its gaseous state has mass. Since all matter occupies space, it has density, since density is defined as mass per unit volume, where volume is space.

Larger objects dont always have more mass than smaller objects.

Chemistry
Atoms and Atomic Structure
Molecular Mass