Question

Определите массу MgO,если масса Mg=12г.Помогите людииии пожалуйстаааа❤❤

Answer 1

N,m ? 0,5моль
2Mg+O2=2MgO
2моль 2 моль
48г
n(Mg)=2*0,5/2=0,5(моль)
m(Mg)=0,5*24=12(г)
m=n*M(Mr) M=Mr Mr(MgO)=24+16=40 M=40г/моль
m(MgO)=0,5*40=20(г)
0,5 моль; 12г; 20г
ответ: m(MgO)=20 грамм

Answer 2

Calculating the Mass of MgO

To determine the mass of MgO, we can use the molar ratio of magnesium (Mg) to magnesium oxide (MgO) and the given mass of Mg.

The molar mass of MgO is 40.3 g/mol, which means that 1 mole of MgO has a mass of 40.3 grams.

Given that the mass of Mg is 12g, we can use the molar ratio of Mg to MgO to find the mass of MgO.

Step 1: Calculate the moles of Mg using its molar mass: - Moles of Mg = Mass of Mg / Molar mass of Mg - Moles of Mg = 12g / 24.3 g/mol - Moles of Mg = 0.5 moles

Step 2: Use the molar ratio between Mg and MgO to find the moles of MgO: - The balanced chemical equation for the formation of MgO from Mg is: `2Mg + O2 -> 2MgO` - This means that 2 moles of Mg react to form 2 moles of MgO.

Step 3: Calculate the mass of MgO using the moles of MgO and its molar mass: - Moles of MgO = Moles of Mg (from Step 1) = 0.5 moles - Mass of MgO = Moles of MgO * Molar mass of MgO - Mass of MgO = 0.5 moles * 40.3 g/mol - Mass of MgO = 20.15 grams

Therefore, the mass of MgO, if the mass of Mg is 12g, is 20.15 grams. This calculation is based on the molar ratio and molar masses of the substances involved