Chalk contains 3 percent carbon 10 percent calcium and oxygen find the amount in grams of each of these substances in 1 kg
ans is 120 grams carbon,400 grams calcium and 480 grams oxyzen
3 % C
10 % Ca
87 % O
Like no way
CaCO3
40 + 12 + 48 = 100 molar mass
40% Ca, 12% C , 48% O
so the real answer is
400 g , 120 g 480 g
BUT using your strange numbers:
in 100 grams:
.03 * 100 = 3 g
.1 * 100 = 10 g
.87 * 100 = 87 g
To find the amount in grams of each substance in 1 kg of chalk, you need to know the percentages of carbon, calcium, and oxygen in chalk.
First, let's convert the percentages to decimals:
- Carbon: 3% = 0.03
- Calcium: 10% = 0.10
- Oxygen: Since the remaining percentage must be oxygen, we can subtract the sum of carbon and calcium from 100%: 100% - 3% - 10% = 87%. Therefore, oxygen comprises 87% = 0.87.
Next, calculate the amount in grams for each substance:
- Carbon: 0.03 (decimal) × 1000 g (1 kg) = 30 g
- Calcium: 0.10 (decimal) × 1000 g (1 kg) = 100 g
- Oxygen: 0.87 (decimal) × 1000 g (1 kg) = 870 g
Thus, in 1 kg of chalk, there are approximately 30 grams of carbon, 100 grams of calcium, and 870 grams of oxygen.