Mass + percentages - practice problems - page 3 of 10
Number of problems found: 194
- KOH
How many g of 20% KOH solution do we need to mix with 500 g of 30% KOH solution to obtain a 25% KOH solution? - Salt solution
Calculate the weight of a 50% salt solution we prepare from 120 g of salt. - Beef taxation
In December, beef cost € 5.71 per 1 kg. How much should the price of 2.5 kg of beef change if VAT changed from 20% to 10%? How much will 2.5kg cost in January? - Chocolate bar
Shen's chocolate bar is 54% cocoa. If the weight of the chocolate bar is 54 grams, how many grams of cocoa does it contain? Round your answer to the nearest tenth.
- Feed to hay
How many tons of water do we have to dehydrate from 8 tons of feed if the original moisture is 54 percent to get hay with a moisture content of 15 percent? Round to two decimal places. - Percentage 45811
There is 3.8 kg of flour in 5 kg of black bread. What percentage of the weight of bread is flour? - Grams 44441
How many grams of 70% and 45% acid must be mixed to form 300 grams of 60% acid? - Calculate 44351
Calculate how many grams of iodine and ethanol are needed to prepare 200 grams of 6% iodine in ethanol solution. - 80-kilogram 40741
The 80-kilogram man who caused the car accident had 2.5% blood alcohol. Determine how many grams of alcohol he had in his blood if the blood made up 8% of a person's weight.
- Solution 38451
Prepare 2 liters (kg) of a 3% salt solution in water. - Salicylic 38401
Prepare 600 g of an 8% solution of salicylic acid. - Solution 38391
Prepare 100g of a 15% blue rock solution. - Base of percentages
7% of the base is 35 kg. What is 39% of that base? - Percentage 37941
What percentage is 119 t of 85 t?
- Bronze 37391
Bronze is an alloy of tin and copper. Copper is 85% the rest is tin. How much bronze do we make from 51 kg of copper? Will 8 kg of tin be enough for us? - Percentage 37141
Mix 0.8 kg of sugar into 2.4 kg of water. What percentage of sugar solution do we get? - Electric cooker
During which time, does an electric cooker with power input P = 500 W and with efficiency n = 75% heat water with mass m = 2 kg and temperature t1 = 10°C to the boiling point (t2 = 100°C). The specific heat capacity of water is c = 4 180 J. Kg-1. K-1 - Fertilizer 34851
Urea contains 45% nitrogen. How much fertilizer will be needed per 1 hectare if you supply 30 kg of pure nitrogen? - Percentage 34761
The company's new management has announced that mass layoffs will be necessary due to the poor financial situation. It is estimated that the work that 5 employees did will have to be done by 3 employees. What percentage of the company's employees would lo
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