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3,45 grams of H2O contain 1,154.10e23 oxygen atoms.

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How many grams are in 345 milligrams?

There are 1000 milligrams in one gram. Therefore, 345 milligrams is equal to 345/1000 = 0.345 grams.


What is the volume of 0.24 mol oxygen gas at 345 k and a pressure of 0.75 ATM?

The volume of a gas can be calculated using the ideal gas law equation: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature in Kelvin. Rearranging the equation to solve for V gives V = (nRT)/P. Plugging in the values n = 0.24 mol, R = 0.0821 L.atm/mol.K, T = 345 K, and P = 0.75 ATM, we get V = (0.24 mol * 0.0821 L.atm/mol.K * 345 K) / 0.75 ATM ≈ 6.43 L.


Calculate the number of grams 0.345 moles Cu x 63.546 g Cu?

1 mol of an element is equal to it's atomic weight, but with grams instead of amu (or daltons) as the unit. For example, with copper (Cu), 63.5 amu is its rough atomic weight, which means it weighs roughly 63.5g per mol. Then we just need to divide through. 63.5 x 0.345 = 21.9g


The formula for methane is CH4. Four moles of methane would have a mass of how many grams?

To calculate the mass of four moles of methane (CH4), we first need to determine the molar mass of methane. The molar mass of CH4 is the sum of the atomic masses of carbon (12.01 g/mol) and hydrogen (1.008 g/mol) multiplied by the number of atoms in the compound. Therefore, the molar mass of CH4 is 12.01 g/mol + 4(1.008 g/mol) = 16.04 g/mol. To find the mass of four moles of methane, we multiply the molar mass by the number of moles: 16.04 g/mol x 4 mol = 64.16 grams. Therefore, four moles of methane would have a mass of 64.16 grams.


What is melamine's melting point?

melting point of approximately 354°C 669.2°F