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19 November, 06:19

The mass of a sample of sodium bicarbonate is 2.1 kilograms. There are 1,000 grams in 1 kg, and 1 x 10^9 nano-grams in 1 g. What is the mass of this sample in ng?

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  1. 19 November, 07:25
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    21 Kg of sample = 2.1 x 10¹² ng

    Explanation:

    Data given:

    mass of a sample of sodium bicarbonate = 2.1 kilograms

    1000 = 1 kg

    1 x 10⁹ nano-grams = 1 g

    2.1 kilograms = how many nano grams

    Solution:

    first we will convert Kg to grams

    As we know

    1 Kg = 1000 g

    2.1 kg = grams of sample

    So,

    by doing cross multiplication

    grams of sample = 2.1 Kg x 1000g / 1 kg

    grams of sample = 2100 g

    So,

    2.1 Kg of sample = 2100 g

    Now we will convert 2100 grams to nano-grams

    For this we know that

    1 g = 1 x 10⁹ ng

    2100 g = ng of sample

    So,

    by doing cross multiplication

    ng of sample = 2100 g x 1 x 10⁹ ng / 1 g

    ng of sample = 2.1 x 10¹² ng

    2100 g of sample = 2.1 x 10¹² ng

    So, in other words

    21 Kg of sample = 2.1 x 10¹² ng
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