1 liter of drink contain water = 15% 12l of drink contain water = 15 % 12l of drink contain water at 15% = 1.8l 12l of drink contain water at 50% = 6l Water to add in 15% water drink = 6l â€“ 1.8l = 4.2l After adding 4.2l of water in 12l 15% water drink, we get 50% water drink.

4 0

4 years ago

Using your knowledge of symbols, determine which compound listed must contain both copper and oxygen.

Gemiola [76]

Answer:

The correct option is Malachite which has both copper nd oxygen.

Explanation:

As we the symbol of copper is Cu while the symbols of oxygen is O. As the chemical formula of malachite is Cu₂CO₃(OH)₂. So it has Cu as well as O.

Glucose has only oxygen but no copper

Chalcopyrite has copper but no oxygen

Calcite has oxygen but no copper.

So correct answer is only malachite.

pls give brainlist

5 0

3 years ago

A 7.0 L sample of gas begins at 2.5 atm and 320. K. What is the new pressure if the temperature is changed to 273 K and the volu

enyata [817]

Answer:

2.1 atm

Explanation:

We are given the following variables to work with:

Initial pressure (P1): 2.5 atm

Initial temperature (T1): 320 K

Final temperature (T2): 273 K

Constant volume: 7.0 L

We are asked to find the final pressure (P2). Since volume is constant, we want to choose a gas law equation that relates initial pressure and temperature to final pressure and temperature. Gay-Lussac's law does this:

$\frac{P_{1}}{T_1} =\frac{P_{2}}{T_2} \\$

We can rearrange the law algebraically to solve for $P_{2}$ .

${P_{2}} =\frac{(T_2)(P_{1} )}{T_1} \\$

Substitute your known variables and solve:

$P_2 = \frac{273K(2.5atm)}{320K} = 2.1 atm$

4 0

3 years ago