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

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

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

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Sodium reacts with water. 0.652 NaOH moles will form.

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

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

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

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

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

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

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

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Calculate:

mass/molar mass = moles

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

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45 g is equal to 1,184 moles fluorine.

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

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

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The pressure is approx. 2 atmospheres.

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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.

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Ethane contain 20 % hydrogen.

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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

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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).

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

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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.

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Sulfur dioxide is SO2, so there are 2 moles of oxygen for each mole of sulfur. In 25 moles of SO2, there are 25 moles of S, so there must be 50 moles of oxygen, or 25 moles of diatomic oxygen gas (O2).

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the term gram molecule was used in chemistry and this unit is used to measure a single molecule in gram molecule.