Answer:
7.5 G of copper oxide was reduced by heating of current of hydrogen and the weight of copper that remained was 6.35 gram in another experiment 19.05g of copper was dissolved in nitric acid and the resulting copper nitrate is converted into corporate oxide and the weight of copper oxide form was 23.35 gram show that these data are in accordance with the law of constant composition
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Explanation:
Answer:
2 moles for the first 2 questions and 100g of water
Explanation:
A. The mass of one mole of the virus is calculated by multiplying the mass of a single virus by the Avogadro's number which is equal to 6.022 x 10^23. Performing this operation,
mass = (9.0 x 10^-12 mg)(6.022 x 10^23) = 5.42 x 10^12 mg
In correct number of significant figures, the answer would only have to be 5.4 x 10^12 mg.
b. The number of moles of the virus that will have the same mass as the oil tanker is calculated by dividing the mass of the oil tanker by the mass of one mole of the virus. Note that doing division, both would have to have the same units.
n = (3.0 x 10^7 kg) / (5.4 x 10^12 mg)(1 g/1000 mg)(1 kg/1000 g)
Simplifying,
n = 6
In correct number of significant figures, the answer is 6.0.
The answer is A. A falling barometer means a decrease in air pressure. This is caused by an increase in the local temperatures that warm the air and make it less dense. Clouds start forming when the warm humid air starts to rise and cool. The water moisture turns into water droplets.