Answer:
Bài 1. Có 30g dung dịch NaCl 20%. Tính nồng độ % dung dịch thu được khi
a. Pha thêm 20g H2O
b. Cô đặc dung dịch để chỉ còn 25g.
That means that one mole of sulfur has a mass of 32.065 grams. b) This compound contains two hydrogen atoms and one oxygen atom. To find the molar mass of H2O, we need to add the mass of two hydrogen atoms plus the mass of one oxygen atom. We get: 2(1.008)+16.00=18.016g/mol.
Acceleration is the rate at which velocity changes; here we are told the speed increases by 9.8m/s for each second of travel
assuming the object starts at rest, the object has a speed of 9.8m/s after one second, and a speed of 19.6m/s after two
mathematically, we write
v= at
where v is the velocity, a is the acceleration and t is the time of travel
so v= at = 9.8m/s/s x 2s = 19.6m/s