Question

M1 (раствора) =80гw1= 10%М2 (вещества) = 20 гр w2 = ?

Answer 1

масса вещества 80 * 0.1 =  8 грамм

масса нового раствора 20 + 80 = 100 грамм

массовая доля 8 / 100 = 0.08, или же 8%

Answer 2

To find the weight percent (w2) of the second substance (M2) in the solution, we can use the formula:

w2 = (M2 / M1) × 100%

where: M1 = Total mass of the solution (in grams) M2 = Mass of the second substance (in grams)

Given: M1 (solution) = 80 grams w1 (weight percent of M1) = 10% M2 (substance) = 20 grams

Let's calculate w2:

w2 = (20 / 80) × 100% w2 = 0.25 × 100% w2 = 25%

So, the weight percent of the second substance (M2) in the solution is 25%.