Calculate the grams of calcium present in 70 grams of calcium chloride.

37.1g of Ca

Explanation:

Hello,

Molecular formula for calcium chloride = CaCl

Molar mass = 40 + 35.5 = 75.5g/mol

Assuming there's one mole of CaCl

1 mole = mass / molar mass

Mass = 1 × 75.5

Mass = 75.5g

75.5g of CaCl contains 40g of Calcium

70g of CaCl will contain x g of Calcium

X = (70 × 40) / 75.5

X = 37.086g

Therefore, 70g of CaCl contains approximately 37.1g of Ca

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"