W=(m'/m)·100%
m'=37.2 g
m=48.5 g
w=(37.2/48.5)·100%=76.7%
The answer is c
100% sure its correct . hoped it helped !!
Answer:
<em><u> </u></em><em><u>YES</u></em><em><u> </u></em><em><u>STEEL</u></em><em><u> </u></em><em><u>CAN</u></em><em><u> </u></em><em><u>TURN</u></em><em><u> </u></em><em><u>INTO</u></em><em><u> </u></em><em><u>GAS</u></em><em><u> </u></em><em><u>.</u></em>
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The Celsius temperature scale is based on the boiling and freezing points of water.
The boiling point of water is 100 degrees Celsius.
The freezing point of water is 0 degrees Celsius.
The mass of MgO needed to produce 4.8 tonnes of Mg is
8 tonnes or 2,000 Kg or 2,000 ,000 g
calculation
Si + 2 MgO = SiO2 +2 Mg
step 1 :find the moles of Mg
moles = mass/molar mass
mass = 4.8 tonnes = 480,000 g
molar mass = 24 g/mol
moles is therefore = 480,000 g/24g/mol = 200,000 moles
then by use of mole ratio between MgO to Mg which is 1:1 therefore the moles of MgO is also = 200,000 moles
mass of MgO = moles of MgO x molar mass of MgO
molar mass of MgO = 24 + 16 =40 g/mol
therefore the mass = 200,000 moles x 40 g/mol = 8,000,000 grams or 8,000,000/1000= 8,000 Kg or 8,000/1000 = 8 tonnes