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kati45 [8]
2 years ago
5

The box holds 70 cm3 of water. Water has a density of 10 g/cm³. What is the mass of the water

Chemistry
1 answer:
Ivahew [28]2 years ago
6 0
Volume of water in the box = 70 cm³
Density = 10 g/cm³
Mass of water = ?
By using the following formula we can calculate mass of the water; 
Density = Mass ÷ Volume
Now putting the values;
10 gcm³ = Mass ÷ 70cm³
Mass = 10 x 70
Mass = 700g
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iron will react with oxygen to produce Fe2O3. how many grams of Fe2O3 will he produced if 0.18 mil of Fe reacts?
nasty-shy [4]

Answer:

14.4g

Explanation:

First, we need to write a balanced equation for the reaction between Fe and O2 to produce Fe2O3. This is illustrated below:

4Fe + 3O2 —> 2Fe2O3

From the balanced equation,

4moles of Fe produced 2moles of Fe2O3.

Therefore, 0.18mol of Fe will produce = (0.18x2) /4 = 0.09mol of Fe2O3.

Now we need to find the mass present in 0.09mol of Fe2O3. This can be achieved by doing the following:

Molar Mass of Fe2O3 = (56x2) + (16x3) = 112 + 48 = 160g/mol

Number of mole of Fe2O3 = 0.09mol

Number of mole = Mass /Molar Mass

Mass = number of mole x molar Mass

Mass of Fe2O3 = 0.09 x 160 = 14.4g

6 0
2 years ago
How much heat is required to change the temperature of a 15 g aluminum can with 100 g of water from 24.5°C to 55°C?
Assoli18 [71]
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While heat capacity of water = 4.186 J/g°C
Heat = heat gained by water + heat gained by aluminium 
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